The answer to this question is 7
add 4n and 5n, which is 9. 9n=-9, and if u divide both sides by nine, n=-1
Use a=

r^2 (r represents your radius of 4 feet)

(4^2)
Answer = 16

^2
Answer:
There are 39 different choices
Step-by-step explanation:
Add the the flavors of ice cream the cones and the scoops.
31+2=33
1+2+3=6
33+6=39
Hope this helps
They have $49.00 left for desert because a ticket is $15 for each person 7 and older. So 15 × 3 people = $45.00. $1.50 per slice and they got 4 slices so 1.50 × 4 = $6.00. $45.00 + $6.00 = $51.00. $100 - $51 = $49.00