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Allisa [31]
3 years ago
10

Shawna, Dexter, and Tilana are solving the equation -2.5(5-n)+2=15. Shawna says, “I can begin by dividing each side of the equat

ion by –2.5 to get 5-n-2/2.5=-15/2.5." Dexter says, “I can begin by distributing -2.5 to get -12.5+2.5n+2=15." Tilana says, “I can begin by multiplying each side of the equation by -1/2,5 to get 5-n-0.8=-6." Which students are correct?
Mathematics
2 answers:
Salsk061 [2.6K]3 years ago
6 0
Shawna and Dexter are both correct.
I hope this helps you
laila [671]3 years ago
4 0
Hi!
Shawna is correct because since it's multiplied to the  5-n you have to do the opposite which is division. 
Dexter is also correct because after distributing you can continue solving, there is nothing wrong with that. 
Hope this helps!
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andrew-mc [135]
P1=400
P2=1.01*400=404
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5 0
4 years ago
The measure of angle A to the nearest tenth of a degree is: A 18.5 B 19.5 C 20.5
Andrew [12]

Answer:

B


Step-by-step explanation:

<u>This is a right triangle as shown by the right angle.</u>

  • The side opposite the right angle is the hypotenuse, which is 9.
  • The side opposite angle A is 3.

So we have the opposite of A and the hypotenuse.

The trigonometric ratio that relates opposite side to hypotenuse is SINE.

sin\theta=\frac{opposite}{hypotenuse}

Since, we need angle A, \theta is A, opposite side is 3, and hypotenuse is 9, we substitute:

sinA=\frac{3}{9}\\sinA=\frac{1}{3}

<em>To solve for the angle, we use our calculator and find the inverse sin of \frac{1}{3} :</em>

A=sin^{-1}(\frac{1}{3})\\A=19.47

<em>Rounding to nearest tenth of a degree:</em>

A=19.5

B is the right choice.

6 0
4 years ago
Please help math question 40 pts
boyakko [2]
I think what you would do is add 2x to the other side so you have 2x+3 is greater than or equal to 5. Subtract 3 and then divide by 2 and you are left with x is greater than or equal to 1
4 0
3 years ago
Read 2 more answers
What is the solution of the system of equations? {7/2x−1/2y=9/23x−y=5 Enter your answer in the boxes. ( _ , _ )
dimulka [17.4K]

Answer:

(1, -2)

Step-by-step explanation:

I hope that helps :/

5 0
3 years ago
Read 2 more answers
What is the value of x in the figure below? If necessary round your answer to the nearest tenth of a unit
Dmitry_Shevchenko [17]

Answer:

A

Step-by-step explanation:

Triangle ADC and Triangle BDA are similar. <em>So, we can setup ratios to solve for x.</em>

<em>Similar triangles has corresponding lengths proportional.</em>

<em />

From Triangle ADC, CD corresponds to DA, so

From Triangle BDA, AD corresponds to DB.

<em>Now we can write ratios as:</em>

<em>\frac{CD}{DA}=\frac{AD}{DB}\\\frac{15}{x}=\frac{x}{4}\\x*x=15*4\\x^2=60\\x=\sqrt{60} \\x=7.75</em>

<em />

<em>rounding to nearest tenth, 7.7</em>

correct answer is A

7 0
3 years ago
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