Determine and state whether the sequence 1, 3, 9, 27,... displays exponential behavior

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.

Match the scale and the actual area to the area of the corresponding scale drawing. scale: 1 inch to 4 feet actual area: 128 square feet scale: 1 inch to 7 feet actual area: 147 square feet scale: 1 inch to 8 feet actual area: 256 square feet scale: 1 inch to 5 feet actual area: 225 square feet area of scale drawing scale and actual area scale drawing area: 3 square inches arrowright scale drawing area: 8 square inches arrowright scale drawing area: 4 square inches arrowright scale drawing area: 9 square inches arrowright

Which equation can be used to measure the density of water in a spherical water tank? let w represent the number of water particles within the region.