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FromTheMoon [43]
2 years ago
11

HELP MEHHHHHHHHH. thanks.

Mathematics
2 answers:
jok3333 [9.3K]2 years ago
8 0
The Answer is A .....
maxonik [38]2 years ago
3 0

Answer:A

The mean is the average of all numbers, in this example it's to national averages which will have many numbers.

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Probability question (image included)​
Alexandra [31]

Answer:

b

Step-by-step explanation:

3 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
Simplify: 6y + 5z + 8y – 3z
mezya [45]
Combine like terms. 6y + 8y is 14y. 5z - 3z is 2z. so the answer is 14y + 2z.
4 0
3 years ago
Read 2 more answers
Please help me evaluate the expression 10a + 7 if a =1/5
sattari [20]

Answer:

9

Step-by-step explanation:

10a+7

<u>10(1/5)</u> + 7

<u>2+7</u>

9

6 0
2 years ago
Rewrite the radical as a rational exponent. the fourth root of 7 to the fifth power 7 to the 5 over 4 power 720 7 7 to the 4 ove
adoni [48]
I don't understand what you mean by "720 7 7 to the 4 over 5 power", but for "<span>the fourth root of 7 to the fifth power 7 to the 5 over 4 power</span>" it would be 7^5 (seven to the power of 5)
3 0
3 years ago
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