Item Time bought
MIcroscopes Every 5 years
Safety goggles Every 4 years
Test Tube Every 2 years
It would take 20 years for them to buy these three items at the same time.
We simply need to find the LCM or least common multiple of the 3 items using the number of years.
Microscopes - 5 years → 5, 10, 15, 20
Goggles - 4 years → 4, 8, 12, 16, 20
Test tubes - 2 years → 2, 4, 6, 8, 10, 12, 14, 16, 18, 20
Answer: I think it's 32 in
Step-by-step explanation: Hope that helped!
(X, -Y) so the third question down, because it rotated 90° its only on quadrent moved and clockwise makes it go to the right!
The bag of dog food would last for 21 days.
The bag contains 42 cups of dog food. If the dog eats 
cups everyday, the amount of cup in the bag decreases by cups everyday. This can be represented with this expression: 42 - d. Where d represents the number of days.
In order to determine the number of days in which the bag would be emptied, this equation can be used:
Number of days the dog food would last = number of cups in the cup / amount the dog eats each day
42 ÷
42 ÷ 
42 x 
= 21 days
To learn more, please check: brainly.com/question/11801850?referrer=searchResults
The answer is- 1 (hope this helps)
