Check the picture below.
make sure your calculator is in Degree mode.
For this case we have:
By trigonometric property we have:

Where:

Substituting:

Clearing x we have:

Thus, the equation is: 
Answer:

Answer:
Step one
Step-by-step explanation:
she forgot to do -4×-3 in the parentheses
Answer:
Step-by-step explanation:

School band played for 4 hours.
Answer:
The second one
Step-by-step explanation:
If you know about hyper and Para bolas then the second one also know as a frowny fave parabola is a function