2016 AMC 10A Problem 2 — Solution | LIVE by Po-Shen Loh

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2016 AMC 10A Problem 2

Attempt Problem 2 of the 2016 AMC 10A below, then check your answer against the professionally curated solution from LIVE by Po-Shen Loh. You can also try the full timed exam, view all 2016 AMC 10A solutions, or check the answer key.

All problems are used with official legal permission of the Mathematical Association of America (MAA).

2.

For what value of $x$ does $10^{x} \cdot 100^{2x}=1000^{5}?$

$1$

$2$

$3$

$4$

$5$

Answer: C

Concepts:exponent

Difficulty rating: 770

Solution:

Rewrite all bases as powers of $10$ : $\small 10^x\cdot100^{2x}=10^x\cdot(10^2)^{2x}=10^{5x},$ and $1000^5=(10^3)^5=10^{15}.$

Therefore $5x=15$ , so $x=3$ .

Thus, the correct answer is C.

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