At the bookstore checkout, you watch as the register rings up your purchases and coupons. the prices were as follows: $1.85 $8.56 $6.30 $2.73 $5.25 $4.09 $7.95 – $0.85 (coupon) – $2.10 (coupon) the register gives your total bill as $41.44. estimate the total amount of the bill, by rounding each value to the nearest dollar, and use your answer to determine whether the total on the register is reasonable.

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.

Simplify the expression. -2/5(10+15m-20n)

The investigating team suspected that there were differences in the cost of repairing cars in workshop i and workshop ii. the investigating team suspected that the costs raised by workshop i were greater than workshop ii. for that they tested the repair of 15 cars in each workshop to see the cost of repairs.the decision of the right hypothesis to prove the suspicion above is a. h0 : μ1- μ2­ = 0; ha : μ1- μ2­ ≠ 0 b. h0 : μ1- μ2 ≥ 0; ha : μ1- μ2 < 0 c. h0 : μd ≥ 0; ha : μd < 0 with μd = μ2- μ1 d. h0 : μd = 0; ha : μd ≠ 0 with μd = μ2- μ1 e. h0 : μ1- μ2 = 0; ha : μ1- μ2 ≥ 0