I may be wrong but 5-8 years old
Answer:

Step-by-step explanation:
Required
The equation of the circle
The equation of a circle is:

Where:


From the graph, we have


So:
becomes


21x +70
7•3x + 7•10
21x + 70
Answer:
16 cards in 1 hour
Step-by-step explanation:
8 cards, 1/2 hour
16 cards in 1 hour
Make a proportion.
8/30min= x/60min
Solve the proportion by cross- multiplying.
30x=480
3x=48
x=16
Answer:
49 cartons
Step-by-step explanation:
1: we need to find how many cartons the roses will fill so
1368/28 = 48.857 cartons.
2: We can't have .857 of a carton, so we need 49 cartons to hold all the roses.