What is the equation for a circle given its center is at (4, -1) and its radius is 5? 1(x - 4)2 + (y + 1)2 = 25 2(x + 4)2 + (y - 1)2 = 25 3(x - 4)2 + (y + 1)2 = 5 4(x + 1)2 + (y - 4)2 = 25

(x - 4)² + (y + 1)² = 25

Step-by-step explanation:

Circle Formula: (x - h)² + (y - k)² = r²

We are given r, and (h, k), so simply plug them into the formula to get your answer.

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.