4 Long-distance calls from New York to Harare are priced at
85 cents/min off peak and $1.20/min at peak times.
a) Draw, on the same axes, conversion graphs for the two different rates.
b) From your graph estimate the cost of an 8 minute call made off peak.
C) Estimate the cost of the same call made at peak rate.
d) A call is to be made from a telephone box. If the caller has only $4 to
spend, estimate how much more time he can talk for if he rings at off
peak instead of at peak times.

step-by-step explanation:

the true statements are:

r = set of real numbers

n = set of natural numbers, 1,2,

w = n u{0} = {0,1,}

yes

step-by-step explanation:

yes

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.

i think the answer is b