Students in grades 7 and 8 were asked which food they liked best. The results are shown in the table. Favorite Food Pizza Hot Dog Hamburger Total Grade 7 40 35 100 Grade 8 30 35 100 Total 75 55 70 200 What percentage of all students prefer hot dogs? A 25% B. 27.5% Ос. C. 30% OD. 45.5% OE 55%

, and

for

step-by-step explanation:

we can analyze the pattern at which the terms increase. let us denote , , , so that we can call

note the following:

the pattern: to get the next term value, we just add the next term number (e.g. 1st, 2nd, to the previous term value (term values are the given numbers in the question, 1, 3, 6, 10, 15,

from , to get to , we add

from , to get to , we add

etc.

we need to form a recursive formula, a formula that has the next term as a function of the previous term. so a possible recursive formula can be

, and for

final total: 63

step-by-step explanation:

60 times sales tax

60 times 0.05

3

60 + 3

63