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barxatty [35]
3 years ago
5

Need answer quick. Please tell me the letter i dont need work.

Mathematics
1 answer:
andriy [413]3 years ago
4 0

Answer:

A.

Quick explanation:

+ (-) = -

+ (+) = +

- (+) = -

- (-) = +

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Please explain how to get the answer.
Maru [420]
2r=R

Because 2 of "r" make 1 R
3 0
3 years ago
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Solve the system of linear equations.
icang [17]

Answer: The set does not have a solution

Step-by-step explanation:

Adding Equations 1 & 3 we get 5x = 7. This gives x = 7/5

Putting this value of x in eq. 2 we get

-2y + 2z = -1-(7/5) or

2y - 2z = 12/5  or  5y - 5z = 6

Multiplying eq. 1 by 2  we get  

4x + 2y - 2z = 6

adding this with eq. 2 we get 5x = 5 or x = 1

As the common solution for x from equations 1&3 does not satisfy eq. 1&2 it comes out that the three equations do not have a common solution.

Same can be verified by using different sets of two equations also.

7 0
3 years ago
Four students took a national standardized test for which the mean was 500 and the standard deviation was 100. If a student’s z-
murzikaleks [220]

z = (x - 500) / 100

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675 = x

3 0
3 years ago
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If a person invested half of her money at 9% and half at 7% and received $160 interest, find the total amount of money invested.
mr Goodwill [35]

Answer:

$2000

Step-by-step explanation:

let x be the money she invested

lets assume this was for 1 year

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multiply each side by 2 to cancel the denominators:

0.09x + 0.07x = 320

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5 0
3 years ago
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6 to 4

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Boys 6 / Girls 4

5 0
3 years ago
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