Perimeter is the sum of all the sides. One length equals (x+4) so both of the lengths will equal 2(x+4) = 2x+8. One width is (2x-7) so both will equal 2(2x-7) = 4x-14.
we can write this into an equation like so:
2x+8+4x-14=42
6x-6=42
6x=48
x=8
Then we substitute 8 back into the equations for the lengths of the sides.
8+4= 12 so the length is 12cm
2x8= 16, 16-7=9 so the width is 9cm
Answer:
It would be 8
Step-by-step explanation:
Answer:
cosB = 0
Step-by-step explanation:
From the picture, angle B is a right angle. A right angle has a measurement of 90°. Therefore,
cosB=cos 90°
Solving the cosine of 90°
cosB=0
