Answer:
15÷39
Step-by-step explanation:
I hope it will help you
Answer:
2
Step-by-step explanation:
Answer:
15%
Step-by-step explanation:
Set up a proportion.
Cross-multiply.
Divide both sides by 90.
The discounted price is 85% of the regular price so the
discount is 15%.
cos(20) = sin(70)
note how 20+70 = 90
The general rule is that if x+y = 90, then cos(x) = sin(y). The rule works in reverse as well. Another way to phrase the rule is cos(x) = sin(90-x).
So,

Note: if the computer doesn't like the answer of "sin 70" then try "sin(70)" and see how that works out. It's also possible that the teacher wants the single numeric value of "70" in the first box rather than the "sine" part to go along with it. Though that would be strange and incorrect since cos(20) = 70 is a false statement.