I'm having troubles with these three. step by step ?

1. evaluate the expression if x = 1, y = -1, and z = 9

xz - y2

2. determine how much interest you would earn on the following investment:

$500 invested at a 6% interest rate for 4 years.

3. determine how much interest you would earn on the following investment:

$190,000 invested at a 6.9% interest rate for 9 months.

answer:

1. 8

2. 131.24

3. 9750.04

step-by-step explanation:

1. x*z - y^2 = 1*9 - (-1)^2 = 8

2. assuming compound interest then

interest = 500*1.06^4 -500 = 131.24

3. similarly assuming the annual rate of the interest is given

interest   = 190,000*1.069^(9/12) - 190,000 = 9750.04

the circle graph is not a function.

step-by-step explanation:

the graph of the circle is not a function.

because for a graph to be a function, each value of x must give one value of y

in the circle, the values of x for -2< x< 2 each give 2 values of y.

hence this is not a function.

we need the options

step-by-step explanation: