A car is travelling at 40km per hour. How far does it travel in 2½ hours? a. 16km
b. 80km
c. 90km
d. 100km ​

100

Step-by-step explanation:

If it travels 40 per hours, then it will travel 80 for two hours. You will take 1/2 of 40, which is 20 because of the extra 1/2 an hour. 80+20=100

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.