I n a store, short shelves hold a items, and tall shelves hold b items. PART A Braedyn notices that there are 21 short shelves and 9 tall shelves. How can the expression 21a 1+ 9b help him find the total number of items on the shelves? Explain your reasoning.

what are the things "represented below"?

step-by-step explanation:

nobody can if you dont give the choices

, 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

true

step-by-step explanation:

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could you provide figure.