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viva [34]
3 years ago
7

How many solutions does this equation have? 9c − 10 = –10c − 10

Mathematics
1 answer:
Marina86 [1]3 years ago
6 0
2 solutions because you have 2 different equations
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Solve the system of equations - 6x + 5y = 0 and -5x + 5y = -5 by combining
Anna [14]

9514 1404 393

Answer:

  (x, y) = (-5, -6)

Step-by-step explanation:

The coefficients of y are the same, so we can eliminate y by subtracting one equation from the other. Here, we choose to subtract the first from the second, so that the coefficient of x ends up positive.

  (-5x +5y) -(-6x +5y) = (-5) -(0)

  x = -5 . . . . . . simplify

  -6(-5) +5y = 0 . . . . . . substitute x into the first equation

  6 +y = 0 . . . . . . . . . .  divide by 5

  y = -6 . . . . . . subtract 6

The solution to the system of equations is (x, y) = (-5, -6).

7 0
2 years ago
Determine the sample size required to estimate the mean score on a standardized test within 4 points of the true mean with 98% c
Darina [25.2K]

Answer:

67

Step-by-step explanation:

You have to use fractions to show your work and I'm not going to do that but just know that it is the answer.

3 0
2 years ago
What is the value of y
kirill115 [55]

Answer:

y= 1/15.735. y is o.o64 character so one half is your answer

3 0
2 years ago
Read 2 more answers
A cube has a lateral area of 676 square feet.<br> What is the side length of the cube?
sp2606 [1]

Answer:

13 ft.

Step-by-step explanation:

Lateral Surface area of a cube is the area of 4 sides, front side, back side, left side face and right side face.

It can be seen seen from the attached figure as well.

Each face in a cube is a square. And each side in the cube is equal.

So, Lateral surface area is nothing but 4 \times area of a square.

And we know that area of a square = side^{2}.

Hence, Lateral surface area = 4 \times side^{2}

As per question:

4 \times side^{2} = 676

side^2 = 169 \\\Rightarrow side = 13

Hence, side length of cube = 13 feet.

7 0
3 years ago
How do i rename 2/7 and 10/21 and whats the most common denominator for them
emmainna [20.7K]

Answer:

just multiply 7 by 21 and 21 by 7

like

2*21/7*21. + 10*7/21*7

41/147+ 70/147

111/147. Ans

6 0
3 years ago
Read 2 more answers
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