you just have to find the GCF

1) 15abc² and 25a³bc
2)12x⁵y and 32x⁶y
3)17pqr and 51pqr³
4)7x² and 21x
5)6x², 18x, and -12
6)4x² and 9x
7)11x²y², 33x²y and 3xy²
8)16a²b,24ab and 16b
9)49s²t² and 36s²t²

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