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3 years ago

Answer this and I will give thee a Brainliest award

Mathematics

1 answer:

Svet_ta [14]3 years ago

3 0

It’s C ................

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The equation x^2 + y^2 + 21 = 40 + 18y. What is the radius of this cookie?

trapecia [35]

Answer:

The radius is 10

Step-by-step explanation:

Given

$x^2 + y^2 + 21 = 40 + 18y.$

Required

The radius

Rewrite as:

$x^2 + y^2 - 18y = 40-21$

Subtract 81 from both sides

$x^2 + y^2 - 18y +81= 40-21+81$

Expand

$x^2 + y^2 - 9y - 9y +81= 40-21+81$

Factorize

$x^2 + y( y- 9) - 9(y -9)= 40-21+81$

Factor out y - 9

$x^2 + (y- 9) (y -9)= 40-21+81$

Express as squares

$x^2 + (y- 9)^2= 100$

$x^2 + (y- 9)= 10^2$

The equation of a circle is:

$(x - a)^2 + (y- b)= r^2$

By comparison:

$r^2=10^2$

$r = 10$

6 0

3 years ago

Evaluate the following expression for y = - 2.<br> - 3<br> y

bekas [8.4K]

Answer:

-1/8

Step-by-step explanation:

The given expression is y⁻³

We want to find the value of the expression when y = -2

Thus;

At y = -2, we have; -2⁻³

According to law of exponents, x⁻⁴ = 1/x⁴

Thus; -2⁻³ = -1/2³ = -1/8

4 0

2 years ago

If we spin the spinner 10 times, what is the best prediction possible for the number of times it will land on yellow or purple?

kiruha [24]

Answer:

Yellow = 5 times and I think you meant blue since there is no purple so blue = 3 times

Step-by-step explanation:

There is ten in all and half of the spaces are yellow, or 50%. Out of ten times, you should land on it about half, or 5. For blue, there are 3 spaces, or 30%. Out of ten times, you should lamd on it about three.

3 0

3 years ago

Plsss help me, ASAP, Thank you

ankoles [38]

Answer:

$\frac{1}{16}$ $\frac{10}{9}$

Step-by-step explanation:

a reciprocal is a number that when multiplied by a given number gives 1 as product.

16 * x = 1

x = 1/16

9/10 * x = 1

x = 10/9

8 0

3 years ago

Read 2 more answers

Need some help please!<br>I don't know how to do this.

meriva

Check the picture below.

bearing in mind that twin sides stemming from a common vertex, will make twin angles at the base, thus 74° has a twin.

5 0

3 years ago