Xavier has x nickels and y pennies, having no more than 20 coins worth at least $0.40 combined. A minimum of 10 of the coins are nickels and a maximum of 4 of
the coins are pennies. Solve this system of inequalities graphically and determine one
possible solution.

so then what are you asking?

step-by-step explanation:

, 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

a

step-by-step explanation: