You want to find the LCM of 2 and 15 for this problem.
Multiply them to find the LCM since there are no common factors (besides 1).
Think of everything as numbers first if it is hard for you to comprehend the
word problem. Inez waters them on day 2, day 4, day 6, and so on is the meaning
of “every two days”. On the other hand, she trims them on day 15, day 30, day
45, etc. is the meaning of “every 15 days”. You are now actually finding the
multiples of 15 and 2. The two tasks share a common day which is day 30 is the
meaning of “she did both today”. The question, "When will she do both
again?" is asking how far away the next common day will be which should be
in another 30 days. Therefore, your LCM is 30
The answer to A) 700
The answer to B) 250
3(7v-5)-v(10v-9) = 21v - 15 -10v² + 9v = - 10v² + 30v - 15