Work-out corner has 5 more than 3 times as many exercise bicycles as the gym. together they have 21 bicycles. solve the equation x + 3x + 5 = 21 to find the number of bicycles at work-out corner. a. 4 bicycles b. 17 bicycles c. 7 bicycles d. 25 bicycles

answer: 1) twenty-seven times y

              2) twenty-seven multiplied by y

hello from mrbilldoesmath!

answer:

(7 x + 6 y) (49 x^2 - 42 x y + 36 y^2)

discussion:

the trick is to recognize that 343 = 7^3 and 216 = 6^3 and, in general,

a^3 + b^3 =   (a + b) (a^2 - a b + b^2).

in our case

343x^3+216y^3   =   (7x)^3 + (6y)^3

so take a = 7x and b = 6y in the above equation to get the answer.

you,

mrb

answer: 8 years

step-by-step explanation:

the explanation is that in 8 years the child will be 20 and in 8 years the father will be 40 and 20 is half of 40.