Which situation can not be represented by the equation x 10 45?

For this case we have the following expression:

The last option tells us the following:

There are 45 students in a group. There are also 10 adults in the group. What is x, the total number of students and adults in the group?

So, the variable x can not represent adults and students because they tell us that 45 are clearly students. The equation is not fulfilled with this last option.

Option D

, 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

3

step-by-step explanation: