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MissTica
2 years ago
8

Show by substitution whether the number r is a solution of the corresponding quadratic equation.

Mathematics
1 answer:
Stels [109]2 years ago
3 0

Answer:

It's choice B.

Step-by-step explanation:

When r= -11,

x^2 + 8x - 33 =  (-11)^2 - 88 - 33

= 121 - 88 - 33

= 0

- so x = -11 gives a zero value and is a solution to the equation.

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Solve the equation 53y-55=42y​
tekilochka [14]

Answer:

y=5

Step-by-step explanation:

Move all terms to the left

53y-55-(42y)=0

Add all the numbers together, and all the variables

11y-55=0

Move all terms containing y to the left, all other terms to the right

11y=55

y=55/11

y=5

4 0
3 years ago
You estimate that a jar contains 68 marbles. The actual number of marbles is 60. Find the percent error. Round your answer to th
ANEK [815]

Answer:

27.2

Step-by-step explanation:

Hello!! I for got how to solve this but, I think it is:

68 x 0.60 = 40.8

68 - 40.8 = 27.2

5 0
3 years ago
Anybody know this ? please help
Deffense [45]

Answer:

A.) <em>m ∠ ABD = m ∠ CBD</em>

Step-by-step explanation:

The line segment BD was constructed as an angle bisector, which means that ∠  ABC was split directly in half. This means that the two resulting angles are congruent.

5 0
2 years ago
Slope-intercept form
ASHA 777 [7]
Y=mx+b is this what you want
3 0
3 years ago
3. Nancy and Harry are sliding a stone statue and moving it to a new location in their garden. Nancy is pushing the statue with
Elis [28]

Answer:

197,8879 N.

Step-by-step explanation:

The magnitude of the horizontal force exerted on the statue can be calculated using trigonometric functions.

The question given says that Nancy is pushing the statue with a force of 120 N at a 60° angle to the horizontal and Harry is pulling the statue with a force of 180 N at a 40° angle with the horizontal.

With that information can be calculated the horizontal force exerted on the statue by Nancy, the horizontal force exerted on the statue by Harry and, adding that results, the total horizontal magnitude can be calculated.

The cosine function can be used to calculate the horizontal component of the forces exerted by Nancy and Harry, to determine the horizontal component of the force exerted on the statue.

F= (120 N cos 60°) + (180 N x cos 40°)

F= 197,8879 N

5 0
3 years ago
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