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Welcome to Bytelearn!
Let’s check out your problem:
Solve for
x
x
x
.
5
x
+
213
=
36
5x + 213 = 36
5
x
+
213
=
36
View step-by-step help
Home
Math Problems
Grade 8
Solve two-step inequalities
Full solution
Q.
Solve for
x
x
x
.
5
x
+
213
=
36
5x + 213 = 36
5
x
+
213
=
36
Subtract
213
213
213
:
Subtract
213
213
213
from both sides of the equation to isolate the term with the variable
x
x
x
.
\newline
5
x
+
213
−
213
=
36
−
213
5x + 213 - 213 = 36 - 213
5
x
+
213
−
213
=
36
−
213
\newline
This simplifies to:
\newline
5
x
=
−
177
5x = -177
5
x
=
−
177
Isolate variable x:
Divide both sides of the equation by
5
5
5
to solve for x.
\newline
5
x
5
=
−
177
5
\frac{5x}{5} = \frac{-177}{5}
5
5
x
=
5
−
177
\newline
This simplifies to:
\newline
x
=
−
35.4
x = -35.4
x
=
−
35.4
More problems from Solve two-step inequalities
Question
−
11
x
≥
−
33
-11 x \geq-33
−
11
x
≥
−
33
\newline
Which of the following best describes the solutions to the inequality shown?
\newline
Choose
1
1
1
answer:
\newline
(A)
x
≤
−
3
x \leq-3
x
≤
−
3
\newline
(B)
x
≥
−
3
x \geq-3
x
≥
−
3
\newline
(C)
x
≤
3
x \leq 3
x
≤
3
\newline
(D)
x
≥
3
x \geq 3
x
≥
3
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Posted 10 months ago
Question
3
2
q
≤
9
2
q
−
18
\frac{3}{2} q \leq \frac{9}{2} q-18
2
3
q
≤
2
9
q
−
18
\newline
Which of the following best describes the solutions to the inequality shown?
\newline
Choose
1
1
1
answer:
\newline
(A)
q
≤
3
q \leq 3
q
≤
3
\newline
(B)
q
≥
3
q \geq 3
q
≥
3
\newline
(C)
q
≤
6
q \leq 6
q
≤
6
\newline
(D)
q
≥
6
q \geq 6
q
≥
6
Get tutor help
Posted 10 months ago
Question
Let
g
(
x
)
=
5
−
e
x
g(x)=5-e^{x}
g
(
x
)
=
5
−
e
x
.
\newline
Below is Sean's attempt to write a formal justification for the fact that the equation
g
(
x
)
=
0
g(x)=0
g
(
x
)
=
0
has a solution where
1
≤
x
≤
4
1 \leq x \leq 4
1
≤
x
≤
4
.
\newline
Is Sean's justification complete? If not, why?
\newline
Sean's justification:
\newline
g
g
g
is defined for all real numbers, and exponential functions are continuous at all points in their domains.
\newline
So, according to the intermediate value theorem,
g
(
x
)
=
0
g(x)=0
g
(
x
)
=
0
must have a solution somewhere between
x
=
1
x=1
x
=
1
and
x
=
4
x=4
x
=
4
.
\newline
Choose
1
1
1
answer:
\newline
(A) Yes, Sean's justification is complete.
\newline
(B) No, Sean didn't establish that
0
0
0
is between
g
(
1
)
g(1)
g
(
1
)
and
g
(
4
)
g(4)
g
(
4
)
.
\newline
(C) No, Sean didn't establish that
g
g
g
is continuous.
Get tutor help
Posted 9 months ago
Question
Let
f
(
x
)
=
cos
(
π
⋅
x
)
3
f(x)=\sqrt[3]{\cos (\pi \cdot x)}
f
(
x
)
=
3
cos
(
π
⋅
x
)
.
\newline
Below is Issac's attempt to write a formal justification for the fact that the equation
f
(
x
)
=
0.1
f(x)=0.1
f
(
x
)
=
0.1
has a solution where
1.5
≤
x
≤
2
1.5 \leq x \leq 2
1.5
≤
x
≤
2
.
\newline
Is Issac's justification complete? If not, why?
\newline
Issac's justification:
\newline
f
(
1.5
)
=
0
and
f
(
2
)
=
1
, so
f
(
1.5
)
<
0.1
<
f
(
2
)
.
\begin{array}{l} f(1.5)=0 \text { and } \\ f(2)=1 \text {, so } \\ f(1.5)<0.1<f(2) . \end{array}
f
(
1.5
)
=
0
and
f
(
2
)
=
1
, so
f
(
1.5
)
<
0.1
<
f
(
2
)
.
\newline
So, according to the intermediate value theorem,
f
(
x
)
=
0.1
f(x)=0.1
f
(
x
)
=
0.1
must have a solution when
x
x
x
is between
x
=
1.5
x=1.5
x
=
1.5
and
x
=
2
x=2
x
=
2
.
\newline
Choose
1
1
1
answer:
\newline
(A) Yes, Issac's justification is complete.
\newline
(B) No, Issac didn't establish that
0
0
0
.
1
1
1
is between
f
(
1.5
)
f(1.5)
f
(
1.5
)
and
f
(
2
)
f(2)
f
(
2
)
.
\newline
(C) No, Issac didn't establish that
f
f
f
is continuous.
Get tutor help
Posted 9 months ago
Question
Let
h
(
x
)
=
5
⋅
tan
(
x
)
h(x)=5 \cdot \tan (x)
h
(
x
)
=
5
⋅
tan
(
x
)
.
\newline
Below is Bridget's attempt to write a formal justification for the fact that the equation
h
(
x
)
=
2
h(x)=2
h
(
x
)
=
2
has a solution where
0
≤
x
≤
π
4
0 \leq x \leq \frac{\pi}{4}
0
≤
x
≤
4
π
.
\newline
Is Bridget's justification complete? If not, why?
\newline
Bridget's justification:
\newline
h
h
h
is defined over the entire interval
[
0
,
π
4
]
\left[0, \frac{\pi}{4}\right]
[
0
,
4
π
]
, and trigonometric functions are continuous at all points in their domains.
\newline
So, according to the intermediate value theorem,
h
(
x
)
=
2
h(x)=2
h
(
x
)
=
2
must have a solution at some point in that interval.
\newline
Choose
1
1
1
answer:
\newline
(A) Yes, Bridget's justification is complete.
\newline
(B) No, Bridget didn't establish that
2
2
2
is between
h
(
0
)
h(0)
h
(
0
)
and
h
(
π
4
)
h\left(\frac{\pi}{4}\right)
h
(
4
π
)
.
\newline
(C) No, Bridget didn't establish that
h
h
h
is continuous.
Get tutor help
Posted 9 months ago
Question
Let
f
(
x
)
=
2
5
−
2
x
f(x)=2^{5-2 x}
f
(
x
)
=
2
5
−
2
x
.
\newline
Below is Ibrahim's attempt to write a formal justification for the fact that the equation
f
(
x
)
=
10
f(x)=10
f
(
x
)
=
10
has a solution where
−
1
≤
x
≤
4
-1 \leq x \leq 4
−
1
≤
x
≤
4
.
\newline
Is Ibrahim's justification complete? If not, why?
\newline
Ibrahim's justification:
\newline
f
f
f
is defined for all real numbers, and exponential functions are continuous at all points in their domains. Also,
f
(
−
1
)
=
128
f(-1)=128
f
(
−
1
)
=
128
and
f
(
4
)
=
1
8
f(4)=\frac{1}{8}
f
(
4
)
=
8
1
, so
10
10
10
is between
f
(
−
1
)
f(-1)
f
(
−
1
)
and
f
(
4
)
f(4)
f
(
4
)
.
\newline
So, according to the intermediate value theorem,
f
(
x
)
=
10
f(x)=10
f
(
x
)
=
10
must have a solution at some point between
x
=
−
1
x=-1
x
=
−
1
and
x
=
4
x=4
x
=
4
.
\newline
Choose
1
1
1
answer:
\newline
(A) Yes, Ibrahim's justification is complete.
\newline
(B) No, Ibrahim didn't establish that
10
10
10
is between
f
(
−
1
)
f(-1)
f
(
−
1
)
and
f
(
4
)
f(4)
f
(
4
)
.
\newline
(c) No, Ibrahim didn't establish that
f
f
f
is continuous.
Get tutor help
Posted 9 months ago
Question
Let
g
(
x
)
=
cos
(
π
x
2
)
g(x)=\cos \left(\pi x^{2}\right)
g
(
x
)
=
cos
(
π
x
2
)
.
\newline
Below is Amrita's attempt to write a formal justification for the fact that the equation
g
′
(
x
)
=
0.4
g^{\prime}(x)=0.4
g
′
(
x
)
=
0.4
has a solution where
−
1
<
x
<
4
-1<x<4
−
1
<
x
<
4
.
\newline
Is Amrita's justification complete?
\newline
If not, why?
\newline
Amrita's justification:
\newline
Polynomial and trigonometric functions are differentiable and continuous at all points in their domain, and
[
−
1
,
4
]
[-1,4]
[
−
1
,
4
]
is within
g
′
g^{\prime}
g
′
s domain. Also,
\newline
g
(
−
1
)
=
−
1
and
g
(
4
)
=
1
, so
g
(
4
)
−
g
(
−
1
)
4
−
(
−
1
)
=
0.4.
\begin{array}{l} g(-1)=-1 \text { and } \\ g(4)=1 \text {, so } \\ \frac{g(4)-g(-1)}{4-(-1)}=0.4 . \end{array}
g
(
−
1
)
=
−
1
and
g
(
4
)
=
1
, so
4
−
(
−
1
)
g
(
4
)
−
g
(
−
1
)
=
0.4.
\newline
So, according to the mean value theorem,
g
′
(
x
)
=
0.4
g^{\prime}(x)=0.4
g
′
(
x
)
=
0.4
must have a solution somewhere between
x
=
−
1
x=-1
x
=
−
1
and
x
=
4
x=4
x
=
4
.
\newline
Choose
1
1
1
answer:
\newline
(A) Yes, Amrita's justification is complete.
\newline
(B) No, Amrita didn't establish that the average rate of change of
g
g
g
over
[
−
1
,
4
]
[-1,4]
[
−
1
,
4
]
is equal to
0
0
0
.
4
4
4
.
\newline
(C) No, Amrita didn't establish that
g
g
g
is differentiable.
Get tutor help
Posted 9 months ago
Question
Let
\newline
h
(
x
)
=
x
5
−
2
x
4
+
10
x
2
−
10
x
.
h(x)=x^{5}-2 x^{4}+10 x^{2}-10 x \text {. }
h
(
x
)
=
x
5
−
2
x
4
+
10
x
2
−
10
x
.
\newline
Below is Omar's attempt to write a formal justification for the fact that there exists a value
c
c
c
where
\newline
−
2
<
c
<
2
such that
h
′
(
c
)
=
6
.
-2<c<2 \text { such that } h^{\prime}(c)=6 \text {. }
−
2
<
c
<
2
such that
h
′
(
c
)
=
6
.
\newline
Is Omar's justification complete? If not, why?
\newline
Omar's justification:
\newline
h
(
−
2
)
=
−
4
and
h
(
2
)
=
20
, so
h
(
2
)
−
h
(
−
2
)
2
−
(
−
2
)
=
6.
\begin{array}{l} h(-2)=-4 \text { and } \\ h(2)=20 \text {, so } \\ \frac{h(2)-h(-2)}{2-(-2)}=6 . \end{array}
h
(
−
2
)
=
−
4
and
h
(
2
)
=
20
, so
2
−
(
−
2
)
h
(
2
)
−
h
(
−
2
)
=
6.
\newline
So, according to the mean value theorem, there exists a value
c
c
c
somewhere in the interval
−
2
<
c
<
2
-2<c<2
−
2
<
c
<
2
such that
h
′
(
c
)
=
6
h^{\prime}(c)=6
h
′
(
c
)
=
6
.
\newline
Choose
1
1
1
answer:
\newline
(A) Yes, Omar's justification is complete.
\newline
(B) No, Omar didn't establish that the average rate of change of
h
h
h
over
[
−
2
,
2
]
[-2,2]
[
−
2
,
2
]
is equal to
6
6
6
.
\newline
(C) No, Omar didn't establish that
h
h
h
is differentiable.
Get tutor help
Posted 9 months ago
Question
Let
f
(
x
)
=
x
+
x
3
f(x)=\sqrt{x+\sqrt{x^{3}}}
f
(
x
)
=
x
+
x
3
.
\newline
Below is Lena's attempt to write a formal justification for the fact that the equation
f
′
(
x
)
=
2
3
f^{\prime}(x)=\frac{2}{3}
f
′
(
x
)
=
3
2
has a solution where
0
<
x
<
9
0<x<9
0
<
x
<
9
.
\newline
Is Lena's justification complete? If not, why?
\newline
Lena's justification:
\newline
f
(
0
)
=
0
f(0)=0
f
(
0
)
=
0
and
f
(
9
)
=
6
f(9)=6
f
(
9
)
=
6
, so the average rate of change of
f
f
f
over the interval
0
≤
x
≤
9
0 \leq x \leq 9
0
≤
x
≤
9
is
2
3
\frac{2}{3}
3
2
.
\newline
So, according to the mean value theorem,
f
′
(
x
)
=
2
3
f^{\prime}(x)=\frac{2}{3}
f
′
(
x
)
=
3
2
must have a solution somewhere in the interval
0
<
x
<
9
0<x<9
0
<
x
<
9
.
\newline
Choose
1
1
1
answer:
\newline
(A) Yes, Lena's justification is complete.
\newline
(B) No, Lena didn't establish that the average rate of change of
f
f
f
over
[
0
,
9
]
[0,9]
[
0
,
9
]
is equal to
2
3
\frac{2}{3}
3
2
.
\newline
(C) No, Lena didn't establish that
f
f
f
is differentiable.
Get tutor help
Posted 9 months ago
Question
Let
h
(
x
)
=
3
x
−
x
2
h(x)=3^{x}-x^{2}
h
(
x
)
=
3
x
−
x
2
.
\newline
Below is Uriah's attempt to write a formal justification for the fact that the equation
h
′
(
x
)
=
8
h^{\prime}(x)=8
h
′
(
x
)
=
8
has a solution where
1
<
x
<
3
1<x<3
1
<
x
<
3
.
\newline
Is Uriah's justification complete? If not, why?
\newline
Uriah's justification:
\newline
Polynomial and exponential functions are differentiable and continuous at all points in their domain, and
[
1
,
3
]
[1,3]
[
1
,
3
]
is within
h
h
h
's domain. Also,
h
(
1
)
=
2
h(1)=2
h
(
1
)
=
2
and
h
(
3
)
=
18
h(3)=18
h
(
3
)
=
18
, so
\newline
h
(
3
)
−
h
(
1
)
3
−
1
=
8
.
\frac{h(3)-h(1)}{3-1}=8 \text {. }
3
−
1
h
(
3
)
−
h
(
1
)
=
8
.
\newline
So, according to the mean value theorem,
h
′
(
x
)
=
8
h^{\prime}(x)=8
h
′
(
x
)
=
8
must have a solution somewhere between
x
=
1
x=1
x
=
1
and
x
=
3
x=3
x
=
3
.
\newline
Choose
1
1
1
answer:
\newline
(A) Yes, Uriah's justification is complete.
\newline
(B) No, Uriah didn't establish that the average rate of change of
h
h
h
over
[
1
,
3
]
[1,3]
[
1
,
3
]
is equal to
8
8
8
.
\newline
(C) No, Uriah didn't establish that
h
h
h
is differentiable.
Get tutor help
Posted 9 months ago
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