What is the common ratio?
5, -10, 20, -40, 80
What is the 15th term of the sequence?

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 ?

What dimensions can créate more than one triangle ?

The surface area of the triangular prism is .