What is the dot product of vectors u = <-5, 4> and v=<-8, -6>?

The graph shows the rate at which paint is used to paint a wall.enter values to complete each statement below based on the graph.when 1 gallon of paint has been used, ( # ) square feet of the wall will be painted.the unit rate is ( # )square feet per gallon.

What is the number 321,000,000 in scientific notation? also what is the number? ?

Can someone tell me if these are correct?