Basically you need to find the answer choice that is rational. That way the sum will also be rational.
√7 is irrational as well as π and 0.5050050005...
2/4 is the only rational option.
answer: D
Common difference = 2nd term - first term
= -13-(-6)
= -13+6
= -7
The two equations are equivalent.
The postage for 3 posters is $5.
Lois$ wrote an expression for the total they both spent as 6x + 10 6(25) +10
150 +10 = 160
Clark wrote another expression for the total, saying that it represented the same cost: 2(3x + 5). = 2(3x) + 2(5) 6x + 10 = 6(25) + 10 = 150+10 160
If each poster costs $25, do the two expressions give the same amount?
X = 17
X + 3
———- = 5
4
Multiply both sides of the equation by 4
X + 3 = 20
Move constant to the right-hand side and change its sign
X + 3 = 20
-3 -3
X = 20 - 3
Subtract the numbers
X = 20 - 3
X = 17
