Answer:
7
Step-by-step explanation:
We know that x^a / x^b = x^ (a-b)
b^4 / b^ -3 = b^(4 - -3) = b^ (4+3) = b^7
The exponent for b is 7
Bruce has a rope that is 21 feet long he needs to cut the rope into 1/5 long pieces.
The length of the rope = 21 feet
the length of each strip = 
We need to cut the rope 21 feet into
strips
To find the number of strips we divide 21 feet by the length of the strip
=
= 105
105 strips can Bruce cut from his rope.
The gcf of 15 and 70 is 5
The second and third ones are the true ones
All numbers are real numbers.

is irrational