Answer:

Step-by-step explanation:
we know that
-----> by complementary angles
solve for x

Well, suppose she gets x points in 7th round. Then she wants mean to be 75, meaning
(72+79+74+76+76+75+x)/7=75
Can you find x from here?
Answer:
Total amount spent = 3X+18 +2X = 5X +18 = Total amount spent
Now if we know the total amount spent we can find the price of each ticket
But that is not given unfortunately
Step-by-step explanation:
hope it helps ( ꈍᴗꈍ)