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tangare [24]
2 years ago
14

A certain ore contains 21 percent gold. How much ore (in tons) is needed to obtain 882 tons of gold?

Mathematics
1 answer:
krok68 [10]2 years ago
6 0

Answer:

it would be 4200 ore

Step-by-step explanation:

because 882/.21

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Three times one number added to five times another number is 54. The second number is two less than the first. Use a system of e
worty [1.4K]

Answer:

8 and 6

Step-by-step explanation:

If you use x for the first number, and y for the second, you get equations of 3x+5y=54 and x-2=y.

You can substitute the second equation into the first one to solve it. This gives 3x+5(x-2)=54.

The brackets can be expanded to 3x+5x-10=54. Collecting like terms makes it 8x-10=54.

Next, we add 10 to both sides. This gives 8x=64.

From there, we isolate the x by dividing both sides by 8, giving x=8.

To work out the second number, we can sub 8 for x in either equation (I'm using the second one as it's simpler).

This comes to y=8-2, therefore y=6.

**This content is simultaneous equations, which you may wish to revise. I'm always happy to help!

3 0
3 years ago
What is the fully factored form of the expression 45x²y2 + 18x3
Llana [10]

Answer:

9x^2(5y^2 + 2x).

Step-by-step explanation:

First find the Greatest Common Factor of the 2 terms.

GCF of 18 and 45 = 9

GCF of x^2 and x^3 = x^2.

The complete GCF is therefore 9x^2.

So, dividing each term by the GCF, we obtain:

9x^2(5y^2 + 2x).

4 0
2 years ago
Evaluate f(x)=5•3 ( to the power of x) for x=4
GenaCL600 [577]
The answer is 50625 because 5*3 is 15 and take that to the power of 4
5 0
3 years ago
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Katrina is reading a book that is 400 pages long. She has read 340 pages so far.
Svetach [21]
\frac{340}{400}=\frac{340 \div 4}{400 \div 4}=\frac{85}{100}=85\%

Katrina has read 85% of her book.
7 0
3 years ago
What is the degree of 12x^4-8x+4x^2-3
lord [1]
Dat is 4th degree because x is raised to the 4th power and that is the highest power of the placholder

4th degree
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3 years ago
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