Simplify the expression. write the answer using scientific notation. (2 × 10^13)^-2 a.-4×10^-26 b.0.25 ×10^-26 c.2.5×10^-27 d.2.5×10^-26

  C.  2.5×10^-27

Step-by-step explanation:

(2×10^-13)^-2 = 2^-2 × 10^(13×(-2)) = 1/4 × 10^-26

= 0.25 × 10^-26 = 2.5 × 10^-27

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Your scientific or graphing calculator can compute and display this for you.

answer for #1 is c

answer for #2 is d

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b. 1.25 hr

step-by-step explanation:

if you have a constant speed of 60 mph, then you have a ratio between 60 mi. to 1 hr. dividing both sides by 60 we get the ratio

1 mi. to

then mult. both sides by 75 we get the ratio

75 mi. to

simplifying we get

75 mi. to

or 1.25 hr.