Question

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Answer 1

10

Explanation:

put 20 as the value for x and solve the equation:
(4/5) * 20 -6
= 4*20/5 - 6
= 80/5 - 6
= 16 - 6
= 10

Answer 2

`\huge\boxed{\sf f(20)=10}`

Explanation:

Given function:

`\displaystyle f(x)=(4)/(5) x-6`

Put x = 20

`\displaystyle f(20)=(4)/(5) (20)-6\\\\f(20)=4 * 4 - 6\\\\f(20)=16-6\\\\f(20)=10\\\\\rule[225]{225}{2}`