Use the cubic model y=5a^3-2a^2+a-45 to find the value of y when x=4.

y = 247

Step-by-step explanation:

The given cubic model that expresses the value of y is

y = 5a³ - 2a² + a - 45

We have to find the value of y at a = 4

We can calculate the value of y by putting a = 4

y = 5(4)³ - 2(4)² + 4 - 45

 = 5(64) - 2(16) - 41

 = 320 - 32 - 41

 = 247

y = 247

22.83 repeating

step-by-step explanation:

137 ÷ 6 is 22.8333333 therefore we understand that 3 is repeating.

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