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Let’s check out your problem:
Add.
\newline
89
10
+
(
−
21
5
)
=
\frac{89}{10} + (-\frac{21}{5}) =
10
89
+
(
−
5
21
)
=
_____
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Math Problems
Grade 7
Add and subtract rational numbers
Full solution
Q.
Add.
\newline
89
10
+
(
−
21
5
)
=
\frac{89}{10} + (-\frac{21}{5}) =
10
89
+
(
−
5
21
)
=
_____
Convert to decimal:
Convert
−
21
5
-\frac{21}{5}
−
5
21
to a decimal to make addition easier.
\newline
−
21
5
=
−
4.2
-\frac{21}{5} = -4.2
−
5
21
=
−
4.2
Add
fractions
:
Add
89
10
\frac{89}{10}
10
89
and
−
4.2
-4.2
−
4.2
.
\newline
89
10
=
8.9
\frac{89}{10} = 8.9
10
89
=
8.9
\newline
8.9
+
(
−
4.2
)
=
4.7
8.9 + (-4.2) = 4.7
8.9
+
(
−
4.2
)
=
4.7
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x
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\newline
30.4
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40.4
30.4-40.4
30.4
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\newline
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Question
Solve for
n
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and simplify your answer.
\newline
−
6
=
2
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n
-6=\frac{2}{3} n
−
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=
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\newline
Answer:
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3
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Question
A local package delivery service wants to improve the efficiency of its deliveries. As a first step, the management team decides to conduct a study to determine the average length of time from the arrival of a package at the company's mail center until its delivery at a home. Which of the following methods is most likely to produce valid results?
\newline
Choose
1
1
1
answer:
\newline
(A) The team selects the
1
,
000
1,000
1
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000
heaviest packages in a one-week, non-holiday period and records how long it takes for each package to reach its destination.
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(B) The team calls
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(C) The team selects a random sample of
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\newline
(D) None of the above
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8
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(
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−
2.9
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(
4.3
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(
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Question
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1
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(
l
b
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l
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3
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\newline
(Round the answer to the nearest whole number.)
\newline
□
\square
□
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Posted 9 months ago
Question
Multiply:
\newline
−
0.1
×
−
2
5
=
-0.1 \times \frac{-2}{5}=
−
0.1
×
5
−
2
=
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