Writing and Solving Expressions - General admission to the fair is $8.00, and rides cost $3.00 each.
a. Write an expression to represent the cost for Zachary to attend the fair and go on r rides.
b. Evaluate the expression to find his total cost if he goes on 6 rides.

The expression would be 8 + 3r

Step-by-step explanation:

You'd then subsitute the r for 6 making the expression 8 +3(6) = 24.

16.80 times .20= 3.36

step-by-step explanation:

x^2 + 81

we can factor this using difference of square binomials.

rewrite the equation:

x^2 - (-81)

factor:

(a^2 - b^2) = (√a^2 + √b^2)(√a^2 - √b^2)

(x^2 - (-81) = (x + √-81)(x - √-81)

we can remove the - from under the radical by multiplying it by i.

(x^2 - (-81) = (x + i√81)(x - i√81)

(x^2 - (-81) = (x + 9i)(x - 9i)

we can check our answer by using foil:

x^2 - 9ix + 9ix - 81i^2

x^2 - 81^2

i^2 = -1

x^2 + 81