If f(x) = 7 + 4x and g (x) = startfraction 1 over 2 x endfraction, what is the value of (startfraction f over g endfraction) (5)? eleven-halves startfraction 27 over 10 endfraction 160 270

= 270 ⇒ Last answer

Step-by-step explanation:

* If f(x) = 7 + 4x

* If g(x) =

* We want to find

- Lets find at first

∵ f(x) = 7 + 4x

∵ g(x) =

∴

- Lets divide the numerator by the denominator

∵ The numerator is 7 + 4x

∵ The denominator is

∴ (7 + 4x) ÷

- Lets reverse the division sign to multiplication sign and reciprocal

  the fraction after the division sign

∴ (7 + 4x) ×

∴ = 2x(7 + 4x)

∴ = 14x + 8x²

- Now substitute x by 5

∴   = 14(5) + 8(5)² = 70 + 200 = 270

∴   = 270

36 girls

step-by-step explanation:

the 48 boys is 4 parts of the ratio

divide 48 by 4 to obtain one part of the ratio

= 12 ← 1 part of the ratio

3 parts = 3 × 12 = 36 ← number of girls

2x^2+5x+17

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