Item 18
The box is laid on its side and the white label covers 75% of the lateral surface area of the box. Find the length x of the box.

14

step-by-step explanation:

child does not get an education so she can use the molla on junk

, 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

70

step-by-step explanation: