*WILL MAKE BRAINLIEST*

In the diagram, the measure of angle 3 is 105°.

Which angle must also measure 105°?

a) 1
b) 4
c) 6
d) 8

Ineed asap graph the system of equations 2x+y=5; 14+7y=35

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%

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?