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hodyreva [135]
2 years ago
8

A student says that it 5x^2 =20,then x must be

Mathematics
1 answer:
Verdich [7]2 years ago
6 0
  • I agree with the student.
  • Justification:
  • {5x}^{2}  = 20 \\  =  >  {x}^{2}  =  \frac{20}{5}  \\  =  >  {x}^{2}  = 4 \\  =  > x =  \sqrt{4}  \\  =  > x = 2
  • Therefore, x must be equal to 2.
  • So his statement is right.

Hope you could get an idea from it.

Doubt clarification - use comment section.

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Suppose y varies directly as x Write a direct variation
Kamila [148]

Answer:

y=7.5x, y=60

Step-by-step explanation:

you have to consider x as the input and y as output

when input  x=2 the output  y=15  so it grew by 7.5 so we can say that y= 2*7.5

in general the equation is y= 7.5*x

when x=8 we will have y=7.5*8=60

8 0
3 years ago
Liam babysat for 3 1/2 hours and made $31.50. How much money does he make per hour?
anzhelika [568]

Answer:

$9 per hour

Step-by-step explanation:

31.50/3.5 = 3150/350 = 630/70 = 63/7 = 9

Hope this helps!      :3

plz mark as brainliest!

5 0
3 years ago
1.. Find c.<br> please help asap
matrenka [14]

Answer:

10\sqrt{2}

Step-by-step explanation:

The given is a special right triangle with angle measures as follows:

45-45-90

The side lengths for this special right triangle are represented as follows:

a (the side length that sees angle measure 45)

a\sqrt{2} (the side length that sees angle measure 90)

İn the image we can see that one of the side length that sees angle measure 45 is 10

so c, the side length that sees angle measure 90 (hypotenuse),

is equal to

10\sqrt{2}

3 0
2 years ago
Ana is 555 years younger than her sister, Beatriz. 1. Write an equation that represents how old Ana is (a) when Beatriz is b yea
White raven [17]

Answer:

1. B-555

2. -532

Step-by-step explanation

1. Since Ana is 555 years younger you would have to find the difference between their ages, since Ana is younger you would subtract her age, B, from her sister's, Beatriz age, who is 555 years older.

2. If Beatriz is 23 and Ana is 555 years younger you just subtract 555 from 23, which is negative 532

5 0
2 years ago
Read 2 more answers
Richard had 180 total minutes to do
zaharov [31]
3(x+4)= 3x+12
3x+12+x+3+x=5x + 15
5x+15=180
5x=180-15
5x=165
x=165/5
x= 33min

mowing the grass = 3(x+4)
= 3(33+4)
=99+12
=111 min mowing grass
3 0
3 years ago
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