Can some help with questions 5-7

hello,

my name is papa guy i am give verified answer and here just might be one.

the equation of a circle whose center is (h,k) and radius is r is given by:

(x-h)^2+(y-k)^2=r^2

given that center is (0,0) and r =8 and x=7

putting all the values: -

(7–0)^2+(y-0)^2=64

49+y^2 =64

y^2=15

y=+ sqrt(15) [rejected] or y= -sqrt(15)

given in the question is that point a is below the x axis

hence y=-sqrt(15)

=-3.87

you.

not if i am wrong it just might be my fault i haven't done math like this since 8th grade. i am now on my way to collage

domain: ( - ∞,∞), {x l x ∈   r}

range is (-∞,∞), {y l y ∈   r}

i hope this