Write the number in standard form. 7×10^7

The first 7 is the same as 7.0

The second 7 is the exponent over the 10 telling us how many spots to move the decimal to the right. We move to the right because the exponent is positive. So we'll move 7 spots to the right to go from 7.0 to 70,000,000 which is the number 70 million.

70,000,000

$450 is the answer.

step-by-step explanation:

30% of 450 = 135

450-135=315

341

step-by-step explanation:

all you have to do is 9x31 (which equals 279) and then 20x31 (which equals 620). then you have to subtract. 620-279=341.