A student completes 100 multiplication facts in 4 minutes. How long will it take her to complete 325 facts?

13 minutes

Step-by-step explanation:

Okay so you take 100 divided by 4 which would be 25

so that means she finishes 25 questions per minute

so, then you take every hundred (there's 3) and you divide that by 4

then you'd get 4 times 3 which would be 12 and then you add an extra minute with the remaining 25

the answer would be 13 minutes!

Step-by-step explanation:

Solve by ratios:

, 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

the answer is mp

step-by-step explanation: