1 Answer

Grimgrom · Answer 1 · 2022-05-22T13:41:12+0000

Answer:

A

C

Explanation:

recall the following rule:

$n^x=y\\log_ny=x$

to solve the first one we have

$40(10^x)=15\\10^x=(15)/(40)\\x=log((15)/(40))$

This is equal to

(log(15)/(40))/(log10) or A

same deal for the second one

$10^x=(25)/(50)\\x=log{(25)/(50)=(log((25)/(50)))/(log10)$ or C

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