Lol could someone me with questions 75,77,and 81

75 . Rukle for this sequence is

nth term = -7 + 5/2(n - 1)

(The image is not very clear Im not sure if the common difference is 5/2 or 3/2)

I cant make out 77 or 81.

where is the image?

step-by-step explanation:

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.