What is the 15% of 90

First, lets call the percent we are looking for "p".

"Percent" or "%" means "out of 100" or "per 100", Therefore p% can be written as  

p/100

  When dealing with percent's the word "of" means "times" or "to multiply".

Putting this altogether we can write this equation and solve for  

p

while keeping the equation balanced:

p/100 x 90 =15    

100/90     × p/100  

×

90

=

100

90

×

15

100

90

×

p

100

×

90

=

1500

90

p

=

16.7  

rounded to the nearest tenth.

Step-by-step explanation:

answer:      

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