A rectangle has length 8 cm and width w cm. If its perimeter is 30 cm, what is w?
Note
Use P = 2(l+w). Substitute: 30=2(8+w). Divide by 2: 15=8+w. So w=15-8=7.
A rectangle has length 8 cm and width w cm. If its perimeter is 30 cm, what is w?
Use P = 2(l+w). Substitute: 30=2(8+w). Divide by 2: 15=8+w. So w=15-8=7.