Me find the area of the triangle above

Evaluate the expression for the given value of the variable 7a - 4a for a =8

What is the solution set of the quadratic inequality x^2-5< or equal to 0

Side xy of triangle xyz is extended to point w, creating a linear pair with ∠wyz and ∠xyz. measure of an exterior angle what is the value of x? 64 80 100 180