Please answer below :-)

Mathematics

1 answer:

Serjik [45]3 years ago

7 0

Answer:

B. 88.8

Step-by-step explanation:

let x represent class y

(x+71.2)/2=80 multiply each side by 2

x+71.2=160 subtract 71.2 by both sides

x=88.8

trial an error

replace x with each of the numbers and see if it plugs in.

example:

(80.5+71.2)/2=80

151.7/2=80

75.85=80?

false. incorrect

another example:

(88.8+71.2)/2=80

160/2=80

80=80?

true. correct

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$\large\mathfrak{{\pmb{\underline{\red{Step-by-step\:explanation}}{\orange{:}}}}}$

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