Asquare has sides 10x. write and simplify an expression for the perimeter of that square.
a rectangle has a length of 2x+7 and a width of 3x+8y. write and simplify an expression for the perimeter of that rectangle.

1. Square:

There are 4  equal sides of a square, so Perimeter = side length * 4

Perimeter expression -  (4)10x 

The perimeter of the square is 40x

2. Rectangle:

There are 4 unequal sides of a rectangle, so Perimeter = 2l + 2w

Length: 2x+7

Width: 3x+8y

Perimeter expression - 2(2x+7) + 2 (3x+8y)

(2x+7) *2 = 4x + 14

(3x+8y) *2 = 6x+16y

(4x +14) + (6x + 16y)

4x+6x +16y+14

The perimeter of the rectangle is 10x + 16y + 14

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At a constant it will take one hour to travel 32 mi.at that speed it will take 1/2 hr to travel the remaining 16 mi.it will take 1+1/2 hr to travel the 48mi @ 32mph.so 1 hr = 60 min& 1/2 hr = 30 min1+1/2 hr = 90 min.there are 60s in each 90 × 60 = 3600 seconds.the real question seriously is he why are they driving so slow? ! lol.