what would be the volume of a spherical balloon after 11 seconds, if the radius of the balloon is increasing at 1.3 cm/sec? round to the nearest tenth of a centimeter. include the function

If square root x = -7, then x= -49 true or false

State if the two triangles are congruent. if they are, state how you know?

The first-serve percentage of a tennis player in a match is normally distributed with a standard deviation of 4.3%. if a sample of 15 random matches of the player is taken, the mean first-serve percentage is found to be 26.4%. what is the margin of error of the sample mean? a. 0.086% b. 0.533% c. 1.11% d. 2.22%