What is an equation in standard form of an ellipse centered at the origin with vertex (-7,0)
and co-vertex (0,5)?
a)x^2/5+y^2/7=1
b) x^2/7+y^2/5=1
c) x^2/25+y^2/49=1
d)x^2/49+y^2/25=1

The diameter of a ball is 8 in. what is the volume of the ball? use 3.14 for pi. enter your answer as a decimal in the box. round only your final answer to the nearest hundredth.

What is the value of x? enter your answer in the box. x = two intersecting tangents that form an angle of x degrees and an angle of 134 degrees.

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%