Answer
5
Step-by-step explanation:
8n+10=50
-10 -10
8n=40
8n/8 = 40/8
n= 5
She will be able to buy 5.
DOUBLE CHECK:
8(5)+10=50
40+10=50
50=50
Step-by-step explanation:
correct answer is

<h3>
Answer: Choice C</h3>
Explanation:
This is after using the nCr combination formula

where in this case n = 7 and r = 4. Note how n-r = 7-4 = 3.
We use nCr instead of nPr because the order of the toppings doesn't matter.
V = C(1 - (T/N)).......for C ....multiply both sides by N
NV = CN - CT
NV = C(N - T) ...divide both sides by (N-T)
NV / (N - T) = C
V = C(1 - (T/N))...for T ...multiply both sides by N
NV = CN - CT ....subtract CN from both sides
NV - CN = - CT....divide both sides by -C
(NV - CN) / -C = T or (CN - NV)/ C = T