Explain how you can solve 8x8 if you know how to multiply with 4 but not with 8

Which speed is the fastest (use 1 mile ≈ 1.6 kilometers)? a. 12 miles/hour b. 18 feet/second c. 19 kilometers/hour d. cannot be determined

Which equation represents a line that is parallel to the line whose equation is 3x-2y=7( show all work)

Using only the digits 5, 6, 7, 8, how many different three digit numbers can be formed if no digit is repeated in a number?