Asequence has an initial value of 10 and each term is twice the previous term. which function models this sequence?
1) a(n)=10(2)^n
2) a(n)=10(2)^n-1
3) a(n)=10+2n
4) a(n)=10+2(n-1)

Lets look at available choices:
1) 
 wrong as a(1) should be 10
2)  is the right choice because if you put 1 as n in the first case you will get:

3) 
 wrong as a(1) should be 10 
4) 
 right but...
 wrong as a(2) should be 20

3) and 4) can be dismissed, at once, because the is addition sign between them, and consecutive numbers should be multiplied.

In short 2) is the right answer

Ithink the answer would be knew

first anwser choice.

step-by-step explanation:

the greater/less or equal to symbol (> or < with the line at the bottom) is a closed/filled in circle.

when multiplying or dividing by a negative on both sides you have to flip the inequality sign. this rule only applies to multiplying or dividing by a negative number in inequality equations. this rule is really important.

-5c + 2 _< _27

subtract from both sides by 2

-5c _< _ 27

divide both sides by -5

c _< _ 5.4

flip the inequality sign

c _> _5.4

the only possible answer that would match the simplified inequality is the first answer choice