Q. Which expressions are equivalent to 7−2⋅76 ?Choose 1 answer:(A) 7−272(B) 7−276(C) 7−12(D) (72)2
Apply exponent rule for multiplying powers: Apply the exponent rule for multiplying powers with the same base.When multiplying powers with the same base, you add the exponents.7−2×76=7−2+6Calculate the sum of the exponents.−2+6=4So, 7−2×76=74
Calculate sum of exponents: Check each answer choice to see if it simplifies to 74. A) (72)/(7−2) Apply the exponent rule for dividing powers with the same base. When dividing powers with the same base, you subtract the exponents. (72)/(7−2)=72−(−2) Calculate the difference of the exponents. 2−(−2)=2+2=4 So, (72)/(7−2)=74
Check answer choice A: Check the next answer choice.B) (76)/(7−2)Apply the exponent rule for dividing powers with the same base.(76)/(7−2)=76−(−2)Calculate the difference of the exponents.6−(−2)=6+2=8So, (76)/(7−2)=78This is not equivalent to 74.
Check answer choice B: Check the next answer choice.C) 7(−12)This is simply a power of 7 with an exponent of −12.There is no need to apply any exponent rules here.7(−12) is not equivalent to 74 because the exponents are different.
Check answer choice C: Check the last answer choice.D) (72)2Apply the exponent rule for raising a power to a power.When raising a power to a power, you multiply the exponents.(72)2=72×2Calculate the product of the exponents.2×2=4So, (72)2=74
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