Question

for what values of X would a rectangle have a perimeter of at least 400 when the dimensions are 4x+3 and x+37

Answer 1

P=2(L+W)
P=400
at least 400
P≥400
2(L+W)≥400
2(4x+3+x+37)≥400
2(5x+40)≥400
divide both sides by 2
5x+40≥200
minus 40 from both sides
5x≥160
divide both sides by 5
x≥32

any value that is 32 or greater

Answer 2

I hope this helps you