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evablogger [386]
3 years ago
6

HELPPP MEEE PLEASEE i’ll give you brainlist!!!!

Mathematics
1 answer:
vampirchik [111]3 years ago
3 0

Answer:

the third option.

Step-by-step explanation:

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TanA= 2xy/(x^2+y^2),<br>find sinA​
valina [46]

Step-by-step explanation:

TanA = SinA/CosA

                                 tanA = 2xy / (x² + y²),

                                 Sin A = CosA * 2xy / (x² + y²)

7 0
3 years ago
Josephine can correct her students' test papers in 9 hours, but if her teacher's assistant helps, it would take them 7 hours. Ho
kirill [66]

Using the together rate, it is found that it would take the assistant 31 hours and 30 minutes to do it alone.

<h3>What is the together rate?</h3>

It is the sum of each separate rate.

In this problem, the rates are given as follows:

  • Josephine: 1/9.
  • Assistant: 1/x.
  • Together: 1/7.

Hence:

\frac{1}{9} + \frac{1}{x} = \frac{1}{7}

\frac{x + 9}{9x} = \frac{1}{7}

9x = 7x + 63

2x = 63

x = 31.5.

It would take the assistant 31 hours and 30 minutes to do it alone.

More can be learned about the together rate at brainly.com/question/25159431

7 0
2 years ago
ali wants to buy a piano the piano measures 19/4 feet long she has a space 5 feet long for the paino in her house. does she have
IceJOKER [234]
Yes. This is because 19/4 as a mixed number is 4 3/4. 4 3/4 < 5. It might be a tight fit but she has enough room

Please vote the brainliest!
8 0
3 years ago
What is an algebraic expression for 'two thirds of a number (d) to the third power' ?
horrorfan [7]
It is (2/3d)^3
Make sure the exponent is on the outside. This is because you are raising 2/3d. Not just D

5 0
3 years ago
Read 2 more answers
The perimeter of a rectangle is (10x2).if it's width is (2x-1),which expression represents the length
alexandr402 [8]

Answer: b. 3x + 2

Step-by-step explanation:

2l + 2w = p

2l + 2(2x - 1) = 10x + 2

2l + 4x - 2 = 10x + 2

2l = 6x + 4

l = 3x + 2

4 0
3 years ago
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