What is another way to write this number (3x1000) + (3x10) + (3x1/100) + ( 3x 1/1000)

Evaluate the expression for the given value of the variable 7a - 4a for a =8

List x1, x2, x3, x4 where xi is the midpoint endpoint of the five equal intervals used to estimate the area under the curve of f(x) between x = 0 and x = 10.

An arithmetic series a consists of consecutive integers that are multiples of 4 what is the sum of the first 9 terms of this sequence if the first term is 0