Jordana was shown this diagram of an isosceles trapezoid and its reduction. She was asked to find the perimeter of the reduced trapezoid. Her work is shown below.
30 cm
A
12 cm
4 cm
B
36 cm
Figures not drawn to scale.
Scale factor
Jordana's Work
4.
123
Side A
30x3 =10
Side B
30 x
10
3
Perimeter
10+ 10+4+4 = 28

2x minus y equals 6, x plus y equals negative 3

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

In order for the barge operator to meet his expenses he has to haul at least 120 tons of freight how many railroad cars must be barge operator haul on each trip to at least break even