- 7th Grade Work - The side lengths of a triangle are given by the expressions 7x – 3, 9x – 3, and 9x – 4. Write and simplify a linear expression for the perimeter of the triangle.

1. are the triangles similar and if so why? what is the value of x? show your work.

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%

Is this a polynomial function? i need to know asap