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3 years ago

What are the center and radius of a circle defined by the equation x^2+y^2- 6x+ 8y+ 21=0?

Mathematics

2 answers:

KengaRu [80]3 years ago

8 0

Answer:

It is B, Thank me later

Step-by-step explanation:

Natali5045456 [20]3 years ago

4 0

You have to complete the square. When you do this you get an equation that looks like this: (x-3)^2 + (y+4)^2 = 4. So your center is (3, -4) and your radius is 2. That looks like B to me!!!

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Which matrix represents the system of equations shown below 2x=13 and 3x-2y=11

makkiz [27]

Answer:

A. Matrix A

Step-by-step explanation:

When you put a systems of linear equations in matrix form, you take only the coefficients of the xy terms and sort them. x goes first, y comes after, and the numbers after the bars are the constants.

4 0

3 years ago

Explain part a and b

xxTIMURxx [149]

As i can see there is a table a bove so the x is the first number which going up the graph and the y is across the line

6 0

3 years ago

Will give brainlist if correct!

Sveta_85 [38]

Answer:

A y=5

Step-by-step explanation:

5 0

3 years ago

A=4ℼR2 solve for R SHOW ALL STEPSSSSSSSSSSSSS

GuDViN [60]

Given problem;

A = 4 π R²

To solve for R, we have to make it the subject of the expression.

Since

A = 4 π R² , follow these steps to find R;

Multiply both sides by $\frac{1}{4\pi }$

A x $\frac{1}{4\pi }$ = $\frac{1}{4\pi }$ x 4 π R²

$\frac{A}{4\pi }$ = R²

Then find the square root of both sides

√R² = $\sqrt{\frac{A}{4\pi } }$

R = $\sqrt{\frac{A}{4\pi } }$

The solution is $\sqrt{\frac{A}{4\pi } }$

3 0

3 years ago

Ben and Tom each take a driving test.

GaryK [48]

Answer:

(b)0.56

Step-by-step explanation:

(a)The tree diagram is attached.

P(Ben Fails)=1-0.8=0.2

P(Tom Fails)=1-0.7=0.3

(b)Probability that both will pass their driving test.

P(both will pass)=0.8 X 0.7 =0.56

(c)Probability that only one of them will pass their driving test.

P(Tom Bass, Ben Fails OR Ben Pass, Tom Fails)

=(0.7 X 0.2)+(0.8 X 0.3)

=0.14+0.24

=0.38

3 0

3 years ago