A large chocolate bar has been base of the area of 42.30 square feet in the length is 0.4 foot shorter than twice its width. find the length and the width of the bar

4.7 ft= width

9 ft = length

Step-by-step explanation:

Let w = width

2w - .4 = length

A = lw

42.30  = w(2w - .4)

let's remove the decimals by multiplying thru by 10

(2w + 9)(10w - 47) = 0

2w + 9 = 0    or    10w - 47 = 0

2w = -9     or       10w = 47

w = -9/2 = -4.5     or     w = 47/10 = 4.7

Length cannot be negative, so -4.5 must be ignored

Therefore, w = 4.7 ft= width

                2w - .4 = 2(4.7 -.4) = 9.4 - .4 = 9 ft = length

there are 70 more legs than eyes at the dog show (196 – 126 = 70). dogs have two more legs than eyes, and humans have the same number of legs as eyes. thus 70 is twice the number of dogs at the show, so the number of dogs is half of 70, which is 35. to get the number of humans, subtract 35 from 63: 63 – 35 = 28.

step-by-step explanation: