An earthquake starts 80 km away from the sensor. The speed of the earthquake wave is 4 km/s. Calculate the time it takes the sensor to detect the earthquake in seconds.

Simonne used the following steps to simplify the given expression. 12 - 3(-2x + 4) step 1: 12 + (–3)·(–2x) + (–3)·(4) step 2: 12 + 6x + (–12) step 3: 12 + (–12) + 6x step 4: 0 + 6x step 5: 6x what property of real numbers was used to transition from step 3 to step 4? a. identity property of addition b. inverse property of addition c. associative property of addition d. commutative property of addition

What is the value of r of the geometric series?

If the dimensions of a rectangular prism are 5 ft x 3.5 ft x 2 ſt, what is the surface area?