exam Maths Puzzle Numerical Ability

f(x)= 3x-5
can some one help me solve this.
thank you

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exam Other Question

I need help with this homework problem:
t+22/t square-t-72 + 8/t-9 = 4/t+8

Thank you. if someone wanted an average grade of 90 and they base the grade on 4 tests and the first 3 scores were 84 93 and 88 what would the last test score grade have to be to get a total average of 90?
85
88
92
or
95