Choose the expression that is equivalent to -4 - (-9). A 4 + 9
B 4 - 9
C -4 + 9
D -4 + (-9)​

Atriangle has side lengths of 15 inches and 30 inches. it also has angles that measure 45º and 20º. which of the following identifies the possible third angle of the triangle? a. 15 in., 65º b. 45 in., 65º c. 17 in., 115º d. 14 in., 115º

Suppose a pendulum is l meters long. the time,t,in seconds that it tales to swing back and forth once is given by t=2.01

Asystem of equations has 1 solution.if 4x-y=5 is one of the equations , which could be the other equation ?