Question

What is the value of 1/2 x3 + 3.4y when x = 4 and y = 2? (4 points)


12.8

14.8

25.8

38.8

Answer 1

\(x^3 = x^2\times x= x\times x\times x\)
Now try to write the expression by substituting the values.

Answer 2

hmmm

Answer 3

so its C

Answer 4

Nope. Show me the expression after substituting the values.

Answer 5

Im not good at math sadly ;-;

Answer 6

\(\frac{1}{2}x^3+3.4y=\frac{1}{2}(4)^3+3.4(2)\)

Answer 7

idk ;-;

Answer 8

brb

Answer 9

\[\frac{ 1 }{ 2 } x^{3}+ 3.4y \]
substitute then the given value of y and x

Answer 10

\(\frac{1}{2}x^3+3.4y=\frac{1}{2}(4\times 4\times 4)+3.4\times2\)

Answer 11

\[\frac{ 1 }{ 2 }x ^{3} + 3.4y = \frac{ 1 }{ 2 }(4^{3})+3.4(2)\]

Answer 12

since \[4^{3}=4\times4\times4=16\times4=64\]

then \[\frac{1}{2} (4^3) + 3.4(2) = \frac {1}{2} (64)+ 3.4(2)\]

we can see that
\[\frac {1}{2} (64) = \frac {64}{2}\]
which is equal to 32.

\[32 + 3.4(2)= 32+6.8\]
\[=38.8\]