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3 years ago

15

Tonya bought x bottles of juice for $2 each and y cartons of eggs for $5 each. she spent $18 in all. Which equation represents t

his situation?

2 answers:

zepelin [54]3 years ago

7 0

Always group money together so 2x+5y=18 ($)

blagie [28]3 years ago

3 0

Answer:2x +5y=18

Step-by-step explanation:

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2 years ago

⅘ of a packet of sweets are fizzy. If there are 40 sweets in the packet, how many are fizzy sweets?

Colt1911 [192]

Answer:

32 fizzies

Step-by-step explanation:

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3 years ago

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2 years ago

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It is given that y varies inversely as x^2. If x is decreased by 50%, find the percentage change in y.

vova2212 [387]

Answer:

300%

Step-by-step explanation:

Given

$y\ \alpha\ \frac{1}{x^2}$

Required

Find the percentage change in y when x decreased by 50%

First, convert to equation

$y\ = \ \frac{k}{x^2}$

Where k is the constant of proportionality

When x decreased by 50%

$Y = \frac{k}{(x - 0.5x)^2}$

$Y = \frac{k}{(0.5x)^2}$

$Y = \frac{k}{0.25x^2}$

Expand

$Y = \frac{1}{0.25} * \frac{k}{x^2}$

Substitute $\frac{k}{x^2}$ for y

$Y = \frac{1}{0.25} * y$

$Y = 4 * y$

$Y = 4 y$

The percentage change is then calculated as:

$\%Change = \frac{Y - y}{y} * 100\%$

$\%Change = \frac{4y - y}{y} * 100\%$

$\%Change = \frac{3y}{y} * 100\%$

$\%Change = 3 * 100\%$

$\%Change = 300\%$

<em>The percentage in y is 300%</em>

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2 years ago

12<br>121 °<br>9<br>can it make a triangle if so what the area ?<br>

charle [14.2K]

Answer:

no it can not

Step-by-step explanation:

Triangle is always 180° in total.

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3 years ago

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