Question

What is the value of Fraction 1 over 2x3 + 3.4y when x = 2 and y = 5?

18
20
21
37

Answer 1

`C. \`
`(1)/(2)x^3 + 3.4y = 21`

Explanation:

Given

`x = 2`

`y = 5`

Required

`(1)/(2)x^3 + 3.4y`

Substitute 2 for x and 5 for y;

The expression becomes

`=\ (1)/(2) * 2^3 + 3.4 * 5`

Multiply 3.4 by 5

`=\ (1)/(2) * 2^3 + 17`

---------------------------

`2^3 = 2 * 2 * 2 = 8`

--------------------------

`=\ (1)/(2) * 8 + 17`

`=\ (8)/(2) + 17`

`=\ 4 + 17`

`=\ 21`

Hence;

`(1)/(2)x^3 + 3.4y = 21`