I'm having so much trouble! it's quite easy!

F(x)=x/2-2 and g(x)=2x^2+x-3 find (f+g)(x)

Erin bought christmas cards for $2 each to send to her family and friends. which variable is the dependent variable?

Lizette is training for a marathon. at 7: 00 she left her house and ran until 8: 30, then she walked until 11: 30. she covered a total distance of 18 miles. her running speed was six miles per hour faster than her walking speed. find her running and walking speeds in miles per hour.