Rosy has two faulty alarm clocks. clock a rings every six hours, and clock b rings every nine hours. when will they both ring together for the first time?
choices
a. after 6 hours
b. after 9 hours
c. after 15 hours
d. after 18 hours
i need this done asap. first one to answer will definitely get a thx.
and you

What is the measure of ac? 5 units 13 units 26 units 39 units 3x- 2b 6x + 9

0if x and y vary inversely and y=6 as x=7, what is the constant of variation?

Acompany manufactures three types of cabinets. it makes 110 cabinets each week. in the first week, the sum of the number of type-1 cabinets and twice the number of type-2 cabinets produced was 10 more than the number of type-3 cabinets produced. the next week, the number of type-1 cabinets produced was three times more than in the first week, no type-2 cabinets were produced, and the number of type-3 cabinets produced was the same as in the previous week.