Find the value of this expression if x = -9.
X-7
x +7

Carter drank 15.75 gallons of water in 4 weeks. he drank the same amount of water each day.a. estimate how many gallons he drank in one day.b. estimate how many gallons he drank in one week.c. about how many days altogether will it take him to drink 20 gallons?

Xto the second power plus 14x plus 48. what are the factors? we are doing factoring trinomials with a=1

If the value of cos330°is√3/2 then find cos 165°.