Can you help me with this it's synthetic substitution or direct substitution

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[Eqn 3]

f(x) = x³ + 3x² + 6x - 11 when x = 5

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[Eqn 4]

f(x)=x³ - x² + 12x - 15 when x = 1

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[Eqn 5]

f(x) = 2x³ + 6x² + 4x + 8 when x = 2

x/7.50 = 15

x= 7.50 / 15 divide

step-by-step explanation:

answer:

1. 0.04

2. 0.15

step-by-step explanation:

i just finished that assignment for properties of probability distributions.