9. A triangle has a perimeter of 90 centimeters.

a. Write and use a linear system to determine

the lengths of sides l, m, and n.

_=m-n

b. Is the triangle a right triangle? Explain.

m = 5n - 5

87. In how many different ways can you make exactly $0.75 using only nickels, dimes, and quarters, if you must have at least one of each coin? A. 2 B. 4 C. 6 D. 7 E. 12

Solve the absolute value equation I2-3xl=6-x

What two integers are between the square root of 6?

What is the number of possible permutations of 5 objects taken 2 at a time? A. 10 B. 20 C. 60 D. 120

Is the number 29 prime or composite? prime composite

Consider the function f (x) = 5 (x - 4) + 9. Determine f (2b).

Use trigonometric identities to rewrite the equation sec theta / csc theta = 1

What times what equals 150 but also what plus what equals 31

A college student needs 11 classes that are worth a total of 40 credits in order to complete her degree. The college offers both 4-credit classes and 3-credit classes. How many 4-credit classes does this college student need to complete her degree?

When must a system of linear equations be solved algebraically, not graphically? Whenever the solution to a system does not have coordinates, it can be difficult or impossible to find the precise answer through graphing.