MATH EXPONENTIAL HELP?

Edgar is getting better at math. On his first test he scored 50 points. Then he scores 53, 56, 59 and 62 on his next 4 tests. If he takes 20 tests, how many points will he earn on his last test?

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    Assuming there is a pattern: 50, 53, 56, 59, 62, the formula is:

    Tₙ = 47 + 3n

    T₂₀ = 47 + 3(20)

    T₂₀ = 107 points

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