Barbara signed up for dance lessons at Dance Unlimited she was charged $55 per month for lessons and a one time recital fee of $165 the equation represents the $495 total cost that Barbara paid to Dance Unlimited
how many months,
,did barbara
receive dance lessons from Dance Unlimited?

Ⓐ︎ 2.25 months
Ⓑ︎ 6 months
Ⓒ︎ 12 months
Ⓓ︎ 9 months

For the right triangle shown, the lengths of two sides are given. find the third side. leave your answer in simplified, radical form.

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

Heather, sarah, nicky, and jill each have nine markers. how many markers do they have in all?