Question 10 of 10 What is the vertex of the graph of the function below?
y = x2 - 10x+ 21
O A. (5,-4)
O B. (5,0)
O C. (3,0)
O D. (3,-4)
SUBMIT
Answer this please

What basic trigonometric identity would you use to verify that sin x cos x tan x =1-cos^(2)x?

Answer pls man im trying to get out of summer school

1. 2. ∠b and ∠y are right angles. 3.? 4.? which two statements are missing in steps 3 and 4? ∠x ≅ ∠c △abc ~ △zyx by the sas similarity theorem. ∠b ≅ ∠y △abc ~ △zyx by the sas similarity theorem. = 2 △abc ~ △zyx by the sss similarity theorem. = 2 △abc ~ △zyx by the sss similarity theorem.