Which expression is equivalent to 3sqrt 64a^6b^7c^9?

Will give brainliest sum of arithmetic series (sigma notation) find the numerical answer to the summation given below. (image shown below)

Will used 20 colored tiles to make a design in art class. 5/20 of his tiles were red. what is an equivalent fraction for the red tiles?

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers