Answer:
240
Step-by-step explanation:
Since David has 60 fewer storybooks than Huiling, take the total number of storybooks, which is 460 and minus it by 60.
460-60=400
Now, there are 5 units, 5units=400
1unit=80
Since Jenny has 3 times as many storybooks as David, Jenny has 3 units, 3unit=80x3=240
Tip: Draw a model to help you visualise the question better.
7)It is possible for two rectangles to have the same area but not the same perimeter 8) 8cm
Since you are multiplying the same thing by itself, it'll have an exponential value, so count the t's and that is your exponent. Don't forget the "-" sign.