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Ann [662]
3 years ago
7

The opposite of 12 plus a number

Mathematics
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 &lt; 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
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