Find the square root of 85 corrected to nearest 10

Scale factor of 2 is used to enlarge a figure as shown below the area of is 18 in.²

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

Connor took out a 4-year loan to buy a car at a 4% simple interest rate. if he has to pay $240 in interest, how much principal did he borrow?