book Maths Puzzle Numerical Ability

IF TWO ANGLES OF A TRIANGLE MEASURE 30 AND 70 DEGREES WHAT IS THE NUMBER OF DEGREES OF THE THIRD ANGLE OF THE TRIANGEL?

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book Other Question

Tim has completed 2/3 of his math homework. If Tim has completed 12 problems, how many problems were on his homework?

i need an accurate equation so I can study for a test. thanks for your help If someone could please help me with the following problem that would be great.
f(x)=2x^2-3x+7 g(x)=3x+5
19.f(g(x))