Plz ( true - false) all triangles have interior angles whose measure sum to 90.

Two parallel lines are crossed by a transversal.what is value of x

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=

The u-drive rent-a-truck company plans to spend $13 million on 320 new vehicles. each commercial van will cost $25 comma 000, each small truck $50 comma 000, and each large truck  $80 comma 000. past experience shows that they need twice as many vans as small trucks. how many of each type of vehicle can they buy?