Divide botoh sides by 7
x-12=-3
add 12 to both sides
x+12-12=12-3
x+0=9
x=9
Answer:
Step-by-step explanation:
Unfortunately it's not clear what you mean by 6 Σ 2 3(0.5)^n-1. I am going to assume that you mean summing up from n = 2 to n = 6 of the expression 3(0.5)^(n-1). Note that the "n-1" must be enclosed in parentheses.
a(2) = 3(0.5)^(2 -1) = 3(0.5) = 1.5
a(3) = 3(0.5)^(3 -1) = 3(0.5)^2 = 0.75
a(4) = 3(0.5)^(4 -1) = 3(0.5)^3 = 0.375
a(5) = 0.1875
a(6) = 0.09375
Sum these up to find the final answer.
If this is not what you expected, please start over: fix your formatting and put this problem into a new post.
Answer: 9x^2 + 2x - 5
Step-by-step explanation:
6x^2 - 5x + 3 + 3x^2 + 7x -8
Like terms are: (6x^2 and 3x^2), (-5x and 7x), and (3 and -8)
6x^2 + 3x^2 = 9x^2
-5x + 7x = 2x
3 + -8 = -5
9x^2 + 2x - 5 is the simplest answer
Answer:
Pyramid
Step-by-step explanation:I just is