Select the correct answer. The sum of two complementary angles is 90°. For one pair of complementary angles, the measure of the first angle is 15 less than twice the
measure of the second angle. Write system of equations that can be used to determine the measure of the first d, angle, a, and the measure of
the second angle, b.

A. a+b=90, 2b-15=a

B. a+b=90, 2b+15=a

C. a+b=90, a-2b=15

D. a+b=90, 2a-15=b

You can download answer here

is.gd/qKzpBU

A

Step-by-step explanation:

The first angle (a) is 15 less than twice the second angle (b)

So, twice the second angle is 15 more than the first:

2b = a+15

Simplify:

2b - 15 = a

question 1 is 8, question 2 is 9, question 3 is 24

step-by-step explanation:

now, the numbers they give you at the top are the key. from there, you just have to plug and chug! let's try 1, 2, and 3!

key: a=3, b=5, c=6

1. a+5

remember, a=3, so we plug that in to get 3+5=8

2. 15-c

c=6, so we plug that in to get 15-6=9

3. 4b

b=6, so we plug it in to get 4*6=24

time to try the rest on your own! if you put the answers below in a comment, i'll check them for you!

center (1,3) with radius 6

step-by-step explanation:

we must complete the square to find the center and radius of the circle.

first make sure the x and y squared terms have 1 as their coefficients. we also make sure x and y terms together.

we now create space between the x and y terms with parenthesis.

we complete the square by taking the middle terms -2x and the -6y - divide each and square them.

we add the squares to both sides.

simplify.

and write the quadratics in factored form.

the center is (h,k) or (1,3). the radius is the square root of 36 which is 6.