Answer these in scientific notation with work shown, adding scientific notation.

1.8 x 10^5 + 2.8 x 10^1

9 x 10^-4 + 4 x 10-6

2.5 x 10^2 + 8.4 x 10^2

3.9 x 10^-1 + 1.6 x 10^-2

7 x 10^-2 + 9.57 x 10^-3

Find the circumference of a pizza with a diameter of 10 inches round to the nearest tenth

Anne plans to increase the prices of all the items in her store by 5%. to the nearest cent, how much will an artist save if the artist buys a canvas and a frame that each measure 24 by 36 inches before the price increase goes into effect?

Apolice office claims that the proportion of people wearing seat belts is less than 65%. to test this claim, a random sample of 200 drivers is taken and its determined that 126 people are wearing seat belts. the following is the setup for this hypothesis test: h0: p=0.65 ha: p< 0.65 find the p-value for this hypothesis test for a proportion and round your answer to 3 decimal places.