If ^means squared and the 3 is multiplying: 19/75
5^-6=25-6=19
5^3=25(3)=75
19/75
Answer:
Step-by-step explanation:
first one
Answer:

Step-by-step explanation:
Perimeter of a square:
The perimeter of a square of side x is given by:

Perimeter of a rectangle:
The perimeter of a rectangle of length l and width w is given by:

The length of the sides of a square measure 2x-5.
This means that the perimeter of the square is:

The length of a rectangle measures 2x, and the width measures x + 2.
This means that the perimeter of the rectangle is:

For what value of x is the perimeter of the square the same as the perimeter of the rectangle?
This is x for which:

So





Answer:
one solution; x= -28/10
Step-by-step explanation:
30%=30/100=3/10
3/10 of all=pennies=24
divide by 3
1/10 of all=8
times 10
10/10 of all=80
80 coins she has