21x-9+63=180
21x+54=180
21x=126
x=6
First you need to get rid of the parenthesis by distributing the 0.6 to each term inside.
(0.6)(10n) + (0.6)(25) =10+5n
6n +15 = 10+5n subtract the 5n on both sides and subtract 15 from both sides
6n-5n = 10-15
n=-5
30
Explanation:
5×6=30
3×10=30
hope this helps...I just looked it up and this is what I found
Strictly speaking, x^2 + 2x + 4 doesn't have solutions; if you want solutions, you must equate <span>x^2 + 2x + 4 to zero:
</span>x^2 + 2x + 4= 0. "Completing the square" seems to be the easiest way to go here:
rewrite x^2 + 2x + 4 as x^2 + 2x + 1^2 - 1^2 = -4, or
(x+1)^2 = -3
or x+1 =i*(plus or minus sqrt(3))
or x = -1 plus or minus i*sqrt(3)
This problem, like any other quadratic equation, has two roots. Note that the fourth possible answer constitutes one part of the two part solution found above.
Answer:
Step-by-step explanation:
Multiply the first term by 
, the second term by 
, the third term by 
.
<u>The first term becomes:</u>
<u>The second term becomes:</u>
<u>The third term becomes:</u>
<u>Their sum is:</u>
Correct choice is B
