Leeann wants to buy a new tablet that costs $500. She has already saved 25% of the money. How much additional money does Leeann need to save to have enough money to buy her tablet?

a.125$
b.150$
c.350$
d.375$

D

Step-by-step explanation:

if the total cost is $500 that means that total percentage is 100%, she saves 25% that is $125, she needs additional 75% (where 100% - 25%), that means that she needs 75% 0f $500 which is $375 in order to have enough money to buy her tablet.

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