I don't understand 6k-6k+8-12k

You've received an invoice for $3,000 with terms of 3/10, 1/20, n/30. How much will you have to pay if you pay the bill in 12 days?

Material 1 has Young's modulus Y1 and density rho1, material 2 has Young's modulus Y2 and density rho2, and material 3 has Young's modulus Y3 and density rho 3.

Is it true or false that a rhombus that is a rectangle is also a square

Dan is planning to sell ice cream in new jumbo-size tub it was hold 2times as much as the large carton which holds 41/2 pounds how much ice cream will the jumbo tub hold

8t-5r-t-3r I'm so confused on equations

The base of a prism is a right triangle. The lengths of the legs of the right triangle are 5 inches and 7 inches. The height of the prism is 8 inches. What is the prism's volume? A. 20 in. B. 140 in. C. 96 in. D. 280 in.

A triangle has a base of 3 cm greater than five times its height. What is the area of the triangle when its height is 6 cm 115 cm² 60 cm² 33 cm² 99 cm²

What is the solution for the equation -6.4 = 5.0 + 2.4m?

14. Shaun has a bag with 12 yellow tiles and 14 green tiles. How many green tiles should be added so that the ratio of yellow tiles to green tiles is 2 to 3?

Find the missing length in the right triangle. 3 in. 12 in.