Mattie has a swimming pool. She put a rectangular fence around the pool. How many feet of fencing did she use if the length of the pool is 21 feet by 16 feet?

I assume you mean the lengths and widths are 21 and 6 feet, so we need to find the perimeter, which would be 21+21+6+6=54 right?

Step-by-step explanation:

answer: bearing in mind that a rectangle has a perimeter of length + length + width + width.

step-by-step explanation:

p = perimeter

l = length

x=width

p = 2l + 2x

p = 2(l+x)     < ==== perimeter of the base of the box.

c.

step-by-step explanation:

substitution for (0,1)

y=x^2+4x+1

1=0^2+4(x)0+1

1=0+4(x)0+1

1=4(x)0+1

1=0+1

1=1

substitution for (-3,-2)

y=x+1

-2=-3+1

-2=-2