What is x if 10+x/2=3

So i'm having a bit of trouble with the same thing again, sorry for asking this many questions for the same lesson but my moms bf who passed and was top in his calculus classes didn't even understand it!

What is a signal 9 on a police scanner? They just said she "dropped a signal 9" (sorry this is in math idk where this goes)

2.1 + (-3.7h) + 1.9h - 1.4

A shoe store donated a percent of every sale to hospitals. The total sales were $7,150 so the store donated $286. What percent of $7,150 was donate to the hospitals

What is the value of the digit 8 in alaska's population

What is the value of the expression? 5 (912-14) + 0.5

How do you write add 4 to n then multiply by 5 in algebraic expression

What is the equation of the following line? (-3,1) and (0,0)

Yanni's scooter uses 7 gallons of gasoline to travel 85 kilometers. His dad does some mechanical work to the scooter such that it now uses 5 gallons of gasoline to travel 70 kilometers. If the price of gasoline is $2.

What is the amount in the account that compounds Once a Year after five years?