Question 5: what is the radius of the circle with general form x2+y2-4y=21?
question 5 options:
√21
4.58
5
25

r=5 units

Step-by-step explanation:

we have

Convert the equation of the circle in standard form

Complete the square twice. Remember to balance the equation by adding the same constants to each side

Rewrite as perfect squares

center (0,2)

radius r=5 units

i think the correct option is the second option.

24

step-by-step explanation:

the graph shows 30% of students walk. 80 students were questioned, so the number that said they walk is

30% × 80 = 0.30 × 80 = 24