3 years ago

3(n + 7) = __ + 21 Answer?

Mathematics

1 answer:

SOVA2 [1]3 years ago

7 0

Answer:

3n + 21

Step-by-step explanation:

3(n + 7)

~Distribute

3n + 21

Best of Luck!

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4.Congruent Inangles

Alecsey [184]

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3 years ago

1. –2v – 7 = –23 (1 point) 15 8 –8 –15 2. Start Fraction x over 4 End Fraction – 5 = –8 (1 point) –27 –12 –7 12

lara [203]

Answer:

v = 8
x = -12

Step-by-step explanation:

1. I like to work with positive numbers, so the first thing I'd do is multiply the equation by -1.

2v + 7 = 23

2v = 16 . . . . . subtract 7

v = 8 . . . . . . . divide by 2

Check

-2(8) -7 = -23 . . . . true

___

2. (x/4) -5 = -8

x/4 = -3 . . . . . . . add 5

x = -12 . . . . . . . . multiply by 4

Check

(-12/4) -5 = -8 . . . . true

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4 years ago

What are the exact solutions of x2 - 3x - 5 = 0? x = the quantity of negative 3 plus or minus the square root of 29 all over 2 x

Vinil7 [7]

$x^{2}-3x-5=0 \\ \\ \Delta=(-3)^{2}-4*1*(-5)=9+20=29 \\ \\ \sqrt{\Delta} = \sqrt{29} \\ \\ x_{1}= \frac{3- \sqrt{29} }{2} \\ \\ x_{2}= \frac{3+ \sqrt{29} }{2}$

\\\ Ben

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3 years ago

Read 2 more answers

11.3d04

alexandr402 [8]

Answer:

yes

Step-by-step explanation: did it on test

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3 years ago

A hose fills a hot tub at a rate of 2.58 gallons per minute. How many hours will it take to fill a 268-gallon hot tub?

kakasveta [241]

Answer:

1.73 hours

Step-by-step explanation:

This can be solved with proportions.

$\frac{2.58 gallons}{1 minute} = \frac{268 gallons}{x minutes} \\$

Cross multiply and you get:

$2.58x gallons * minutes = 268 gallons * minutes\\$

Divide by 2.58 gallons and you get:

$x minutes = \frac{268 gallons}{2.58 gallons} * minutes \\x minutes = 103.876 minutes\\x = 103.876 minutes\\$

And to find out the number of hours that is, divide by 60 and you get 1.73 hours.

4 0

4 years ago