The last one: the arc AB is a semicircle.
a semicircle is 180 degrees
Think of PEMDAS, or Please Excuse My Dear Aunt Sally. Which is Parentheses, Exponents, Multiplication and Division, and Addition and Subtraction in that order.
Answer:
4/5
Step-by-step explanation:
sine is opposite over hypotenuse,
so it's 40/50=4/5
Answer:
(6,4)
Step-by-step explanation:
The equation is in 'point-slope' form.

This means we can identify the point that was used in the equation.

(6,4) would be a solution to the equation given.
Hope this helps.
Answer:
The answer is 8 - 4i
you collect the like terms