Question

What is the value of Fraction 1 over 2x3 + 3.4y when x = 3 and y = 4?

Answer 1

hint:
\[\Large \frac{1}{{2{x^3} + 3.4y}} \to \frac{1}{{2 \times \left( {{2^3}} \right) + \left( {3.4 \times 4} \right)}} = ...?\]

Answer 2

25.6?

Answer 3

@Michele_Laino

Answer 4

hint:
\[\frac{1}{{2 \times \left( {{2^3}} \right) + \left( {3.4 \times 4} \right)}} = \frac{1}{{16 + 13.6}} = \frac{1}{{29.6}} = ...?\]

Answer 5

@Michele_Laino im really bad at fractions but i think its 31.6?

Answer 6

it is:
\[\Large \frac{1}{{2 \times \left( {{2^3}} \right) + \left( {3.4 \times 4} \right)}} = \frac{1}{{16 + 13.6}} = \frac{1}{{29.6}} = 0.0338\]
approximated value

Answer 7

\[\large \frac{1}{{2 \times \left( {{2^3}} \right) + \left( {3.4 \times 4} \right)}} = \frac{1}{{16 + 13.6}} = \frac{1}{{29.6}} = 0.0338\]

Answer 8

these are the choices though 15.85
18.1
27.1
31.6

Answer 9

Sorry I have made an error since we have to substitute x=3 before
Nevertheless, my expression above is wrong.

Answer 10

oh

Answer 11

please write your expression using the editor, or make a drawing of your expression

Answer 12

when x=3 and y=4

Answer 13

ok! then we have:
\[\frac{1}{2}{x^3} + 3.4y \to \frac{1}{2} \times {3^3} + 3.4 \times 4 = \frac{{27}}{2} + 13.6 = ...?\]

Answer 14

27.1

Answer 15

that's right!

Answer 16

yay thank you (: @Michele_Laino

Answer 17

:)