Can someone me solve these four problems.

What is r i 4.5+10r=-6.5 with work pls

An internet company charges $8.95 per month for the first 3 months that it hosts your web site. then the company charges $11.95 per month for web hosting. how much money, in dollars, will the company charge for 8 months of web hosting?

Prove that the medians to the legs of an isosceles triangle are congruent. what rule did you use to prove triangles congruent? aaa asa, saa cannot be determined sas sss