Solve for x -2(-x-3)-4x-1=13

Abike shop sells you a bicycle for $63 and a helmet for $21. the total cost is 150% of what the shop spent originally. how much did the shop spend originally? how much profit did the bike shop earn by selling the bicycle and helmet to you ?

Which of the following is true for the relation f(x)=2x^2+1

Ab and bc form a right angle at point b. if a= (-3,-1) and b= (4,4) what is the equation of bc?