8+5(-9+4x) but can only be done like this 2(3+9x)

Help me pls:)

How is the number of vertices for a prism related to the name of the prism

Is the number 128.439 a rational number

Which is an equivalent equation solved for r? the circumference of a circle can be found using the formula c = 2πr. r=cπ r=c(2π) r= c over 2π r= 2π over c