Answer:
3/4 or 75% are boys
Step-by-step explanation:
We need to find a expression that is true. Let's try out every one of them until we get a right answer.
If n + 14 = -15 then n = -1.07143
Replace n with -1.07143.
-1.07143 + 14 = <span>12.92857
</span>
<span>12.92857 does not equal 15.
</span>So, the first option is incorrect.
<span>If 14 + n = -15, then n = -1
Replace n with -1
14 + (-1) = 13
13 is not equal to -15.
</span><span>If 14 + n = -15, then n = -29.0
Replace n with -29.0
</span>-29.0 + 14 = -15
This expression is indeed true.
So, the answer to this question is <span>C If 14 + n = -15, then n = -29.0 </span>
Answer:
The third option
Explanation:
The given expression is:
(x+2)² + 5(x+2) - 6 = 0
Let's check each of the given options:
1- Option A:
(u+2)² + 5(u+2) - 6 = 0
At u = x - 2, the expression would become:
(x-2+2)² + 5(x-2+2) - 6 = 0
x² + 5(x) - 6 = 0 ..........> This option is incorrect
2- Option B:
u² + 4 + 5u - 6 = 0
At u = x-2, the expression would become:
(x-2)² + 5(x-2) - 2 = 0 ..........> This option is incorrect
3- Option C:
u² + 5u - 6 = 0
At u = x+2, the expression would become:
(x+2)² + 5(x+2) - 6 = 0 .........> This option is correct
4- Option D:
u² + u - 6 = 0
At u = x+2, the expression would become:
(x+2)² + (x+2) - 6 = 0 ..........> This option is incorrect
Hope this helps :)