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adoni [48]
3 years ago
12

The ratio of the sum of two numbers to the difference of the two numbers is 9. The product of the two numbers is 80. Find the nu

mbers.
Mathematics
1 answer:
Aneli [31]3 years ago
4 0
There are two equations here:

(a+b)/(a-b) = 9 and ab=80

the first one simplifies to 8a = 10b or a = (4/5)b.

You can plug this last part in for 'a' in the second equation:

(4/5)b*b = (4/5)b^2 = 80 which means b^2 = 64 or b = +8 or -8.

I guess the question asks for the positive solution, so then you will find that a = 10 if you plug the value of b in for one of the original equations. Then your final answer would be a = 10 and b = 8. But, there is another solution, I believe, that is a = -10 and b = -8, since ab would still equal 80 and (a+b)/(a-b) would be -18/-2 which still equals 9. Notice that either a and b are both positive or both negative, because this is the only time that the product of both numbers would be also positive.
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A circle is divided into 8 equal parts. What is the total<br>angle measure of 4 parts?<br>​
snow_lady [41]

Answer:

Step-by-step explanation:

A circle is divided into 8 equal parts means : 360°/8 = 45°

the total  angle measure of 4 parts is :

45°×4=180°

4 0
3 years ago
Write the inequality (without solving)
Lesechka [4]

Answer:

2.15f+4.6n\leq 150

Step-by-step explanation:

She has a budget of $150, which means that she can spend no more than that amount. Therefore, use the less than or equal to symbol: ≤

Each folder is $2.15, so you are going to multiply: 2.15 × f

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You want to know how many notebooks and folders you can buy for $150, so add the notebooks and folders.

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2.15f+4.6n\leq 150

:Done

6 0
3 years ago
PLEASSSEEE HELLPPP
Sidana [21]

Answer:

D: 14q + 21√qr

Step-by-step explanation:

We want to find the product of;

(2√q + 3√r) and 7√q.

Where p and q are integers.

Using distributive property, we have;

(2√q × 7√q) + (3√r × 7√q)

>> 14q + 21√qr

Correct option is D

3 0
2 years ago
What is 15.39-8.99 plzzzz help
pogonyaev
6.40 is the answer


Brainliest for giving u that help?
8 0
3 years ago
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What is the area of the polygon shown below? (in the image). A. 322 mm^2 B. 364 mm^2 C. 520 mm^2 D. 584 mm^2 Show all work pleas
GalinKa [24]

Answer:

A. 322 mm^2

Step-by-step explanation:

First split the shape into two (a rectangle and a triangle).

Then calculate the area of those shapes.

Rectangle: 20 x 14 =  280 mm^2

Triangle: 6 x 14 / 2 = 42 mm^2

Add them together.

280 + 42 = 322 mm^2

3 0
3 years ago
Read 2 more answers
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