What is the value of 2^-3 as a fraction

1/8

Step-by-step explanation:

2⁻³ = 1 / 2³ = 1 / (2*2*2) = 1/8

so the minus sign in the exponent means you can put that factor in the denominator without the minus sign.

1/8

hope it helps

80 miles

Step-by-step explanation:

Speed = distance / time

Speed = 40/45

= 0.89miles/minute

If she continues at this speed, she will cover;

0.89 = distance/ 90

distance = 0.89*90

= 80 miles