3 years ago

4) Increase 340g by 20%

Mathematics

1 answer:

jek_recluse [69]3 years ago

3 0

Add the percentage as a decimal

To 1 to get 1.20

Multiply:

340 x 1.20 = 408

Answer: 408

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Solve for x in the literal equation -5=xy +z.

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The value of y varies directly with x, and y = 343 when x = 49. Find y when x = 8

Ivan

$\bf \qquad \qquad \textit{direct proportional variation} \\\\ \textit{\underline{y} varies directly with \underline{x}}\qquad \qquad y=kx\impliedby \begin{array}{llll} k=constant\ of\\ \qquad variation \end{array}\\\\ -------------------------------\\\\ \textit{we also know that } \begin{cases} y=343\\ x=49 \end{cases}\implies 343=k49\implies \cfrac{343}{49}=k \\\\\\ 7=k\qquad therefore\qquad \boxed{y=7x} \\\\\\ \textit{when x = 8, what is \underline{y}?}\qquad y=7(8)\implies y=56$