Question

The length of a rectangle is 7.8 cm more than 4 times the width. If the perimeter of the rectangle is 94.6 cm, what

are its dimensions?
Select one:
O a. length = 23.8 cm; width = 15.7 cm
O b. length = 39.4 cm; width = 15.7 cm
O c. length = 39.4 cm; width = 7.9 cm
O d. length = 7.9 cm; width = 39.4 cm

Answer 1

Yea it’s c I agree with first answer

Answer 2

C, Length = 39.4 cm; width = 7.9 cm

Explanation:

The permimeter of a rectangle is 2 times the width + 2 times the length or 2(l + w)

The length is 4 times w plus 7.8.

So: 2w+2(4w+7.8)=94.6

= 2w+8w+15.6=94.6 (Factor out the brackets)

= 10w+15.6=94.6 (Combine like terms)

= 10w=79 (Subtract 15.6 from both sides)

= w=7.9 (Divide both by 10).

So, the width is 7.9 cm and the length is 39.4 cm (4 * 7.9 + 7.8)