Question

if 10^2y=25, then 10^negative y=?
a. -1/5
b. 1/5
c. 1/25
d. -1/25​

Answer 1

Answer:

b. 1/5

Step-by-step explanation:

${10}^{2y} = 25$

${ ({10}^{y}) }^{2} = {5}^{2}$

SQUARE ROOT ON BOTH SIDES

${10}^{y} = 5$

RECIPROCAL ON BOTH SIDES

$\frac{1}{ {10}^{y} } = \frac{1}{5}$

${10}^{ - y} = \frac{1}{5}$

Answer 2

Answer:

y=.04 Does not change just because power of does, and sum does. Answer C

Step-by-step explanation:

10^2y=25

100y=25

100 x .04=25

10^-2y=-25