Mean: ( 9 + 7 + 6.5 + 7.5 + 7 + 8 + 5 + 6 + 7.5 + 8 ) : 10 = 7.15
Variance:
(Sigma)² = ( 1.85² + 0.15² + 0.65² + 0.35² + 0.15² + 0.85² + 2.15² + 1.15² + 0.35² + 0.85² ) : 10 ≈ 1.15
Answer: C ) 1.15
Force= mass*acceleration.
-25= 10x
Divide both sides by 10
-2.5=x
Final answer: The acceleration is -2.5 in the direction of the force.
Hey You!
To find this, we can divide:
4000/4 = 1,000
So, 1,000 × 4 = 4,000
First, assume Alex is X years old and that Emma is Y years old.
<span>Since Alex is 6 years older than Emma, it means X - 6 = Y. </span>
<span>Since the sum of their ages is 32, it means X + Y = 32. </span>
<span>Substitute the Y in the second equation with X - 6 to get X + (X-6) = 32. This is simplified to 2X - 6 = 32 or 2X = 38. Solving the equation for X gets that X = 19. </span>
<span>This means Alex is 19.</span>
For the four tickets and the rest of the prices seen up there, it would be $49.75, but if the problem meant that they bought EACH of something, then the total would be $64. :)
