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3 years ago

7

The opposite of 12 plus a number

1 answer:

dlinn [17]3 years ago

6 0

Im pretty sure the answer is Twelve :))

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Solve for x. Enter your answer in interval<br> notation using grouping symbols.<br> x2 + x < 20

Rus_ich [418]

Answer:

x<18

Step-by-step explanation:

2+x<20

6 0

3 years ago

Read 2 more answers

Answer p l e a s e ! !

sergiy2304 [10]

Answer:

$3 = y$

Step-by-step explanation:

24 + 4y = 12y

- 4y - 4y

__________

$\frac{24}{8} = \frac{8y}{8} \\ \\ 3 = y$

I am joyous to assist you anytime.

8 0

3 years ago

How many pounds of a 15% copper alloy must be mixed with 700lb of a 30% copper alloy to maybe a 25.5% copper alloy

lisov135 [29]

Answer:

$300\; \rm lb$ .

Step-by-step explanation:

Let $x$ represent the mass (in pounds) of that $15\%$ copper alloy required, such that the final mixture would contain $25.5\%$ copper by mass.

Consider: if $x$ pounds of that $15\%$ copper alloy is mixed with $700$ pounds that $30\%$ copper alloy, what would be the mass of copper in the mixture?

Mass of copper in $x$ pounds of that $15\%$ copper alloy: $(0.15\, x)\; \rm lb$ .
Mass of copper in $700$ pounds of that $30\%$ copper alloy: $700 \times 0.30 = 210\; \rm lb$ .

Therefore, the mixture would contain $(210 + 0.15\, x) \; \rm lb$ of copper.

The mass of that mixture would be $(700 + x)\; \rm lb$ . The mass fraction of copper in that mixture would be:

$\displaystyle \frac{(210 + 0.15\, x)\; \rm lb}{(700 + x)\; \rm lb} \times 100\%$ .

This ratio is supposed to be equal to $25.5\%$ . These two pieces of equations combine to give an equation about $x$ :

$\displaystyle \frac{(210 + 0.15\, x)\; \rm lb}{(700 + x)\; \rm lb} \times 100\% = 25.5\%$ .

$\displaystyle \frac{210 + 0.15\, x}{700 + x} = 0.255$ .

Simplify and solve for $x$ :

$210 + 0.15\, x= 0.255\, (700 + x)$ .

$(0.255 - 0.15)\, x= 210 - 0.255 \times 700$ .

$\displaystyle x = \frac{210 - 0.255 \times 700}{0.255 - 0.15} = 300$ .

Therefore, $300\; \rm lb$ of that $15\%$ alloy would be required.

4 0

3 years ago

HELPLPOO ASAP PLEASE HELP MEE

Novosadov [1.4K]

The answer is that I think it is 5

6 0

3 years ago

Cameron wants to measure a poster frame, but he only has a sheet of paper that is 8 1/2 b 11 inches

Nataly [62]

Long side is 11 inches
4 times 11=44 inches
that is 44 inches

5 0

3 years ago

Read 2 more answers