book Maths Puzzle Numerical Ability

hi can you please help me solve this expression...

it says: substitute x=-4 and y=-15 to find the value of this expression
-3(4x-y)

thank you

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book Other Question

Find the reference angle R if has the given measure. Enter the measures correct to 0.1 radians. (All measures are given in radians.)

(f) 2
theta R =

(g) 4.5
theta R =
Solve and check the equation 3(4 + 4x) = 12x + 12