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

1) is right

step-by-step explanation:

hello from mrbilldoesmath!

answer:

the domain is the set { -2, 0, 2, 3}

discussion:

the domain is the set of x values in the ordered pairs (x,y). taking the x, or first component, of each ordered pair gives   -2, 0, 2, 3.

you,

mrb