Find the nth term of this quadratic sequence:
4, 7, 12, 19, 28

n^2+3

Step-by-step explanation:

Step 1:

Work out the first differences and that is 3, 5, 7, 9.

Step 2:

Find the second difference and that is 2.

Step 3:

Since half of 2 is 1, then the first term is n^2.

Step 4:

Subtracting n^2 from the sequence gives 3.

So the answer is n^2 + 3.

answer: a and b

step-by-step explanation:

the inequality is:

250c+180g≥950

step-by-step explanation:

let c denotes the number of days in a week   miyoko worked as a cryptographer.

and g denotes the number of days in a week she works as a geologist.

now we are given that she earns $250 for every day she works as a cryptographer,and earns $180 for every day she works as a geologist.

now miyoko's goal is to earn more than $950 this week.

hence, the inequality could be represented as:

250c+180g≥950