Express your answer in scientific notation. 7.4 times 10 to the negative 8th power minus 6.7 times 10 to the negative 9th power.

List x1, x2, x3, x4 where xi is the left endpoint of the four equal intervals used to estimate the area under the curve of f(x) between x = 4 and x = 6. a 4, 4.5, 5, 5.5 b 4.5, 5, 5.5, 6 c 4.25, 4.75, 5.25, 5.75 d 4, 4.2, 5.4, 6

Hurry if the population of of an ant hill doubles every 10 days and there are currently 100 ants living in the ant hill what will the ant population be in 20 days

Which answer choice is it? is it the first ,second,third or fourth giving 40 points for whoever answers correctly you