Intersecting lines r,s and t are shown below.

What is the value of x?

RST is a right triangle with side lengths of r,s, and t, as shown below what is the value of cos ^2 S+ cos ^2 R ?

r (x) =3x -7 t (x) =3x + r (x) The function r and t are defined above. What is the value of t (2) ?

Line l is shown in the xy-plane below. What is the slope of line l?

The average of r and s is 7.5, and the average of r, s and t is 11. What is the value of t?

The graph of a line in the xy-plane has slope (1)/(2) and contains the point (0, 7) . The graph of a seconds line passes through the points (0, 0) and (-1, 3) . If the two lines intersect at the point (r, s) , what is the value of r+s ?

The probability distribution of the discrete random variable X is shown in the table below. What is the expected value of X?

Line t is shown in the xy-plane below What is the slope of line t ?

Variation of alternating current .l. with time .t. is shown in the graph below. What is ther.m.s.value of this current ?

A standard parabola in the x,y coordinate plane intersects the x-axis at (5,0) and (-5,0). What is the value of the x-coordinate of this parabola's line of symmetry?