A person wearing contact lenses is told to wear them for 3 hours on the first day and for 1/2 hour longer on each succeeding day. For how many hours will the person wear the contact lenses on the 10th day?

On the 10th day, the person will wear 8 hours

Step-by-step explanation:

Number of hours that the person wears contact lenses = 3 + 0.5 × n, where n is the respective succeeding day

⇒ Number of hours on the 10th day = 3 + 0.5 × 10 = 3 + 5 = 8

you forgot an image

step-by-step explanation:

hello from mrbilldoesmath!

answer:

25x^2 + 90x + 84

discussion:

mn(x) = m(n(x)) = m( 5x + 9) =

(5x + 9)^2 + 3 =>

25x^2 + 90x + 9^2 + 3 =

25x^2 + 90x + 84                 (as 9^2 = 9*9 = 81)

which is the second choice

regards,  

mrb

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