Answer:
25% of 50 is 12.5
Step-by-step explanation:
30% of 40 is 12. 5% of 30 is 1.5. Lastly, 10% of 45 is 4.5
Anthony can conclude that the difference is significant, because a two minutes difference is not likely to happen by chance. In analyzing data, a statistically significant result is one which is not attributed to chance, that is, there is no way the event could have occur by chance.
Answer:
x = - 7, x = 3
Step-by-step explanation:
To find the zeros let y = 0, that is
- x² - 4x + 21 = 0 ( multiply through by - 1 )
x² + 4x - 21 = 0
Consider the factors of the constant term (- 21) which sum to give the coefficient of the x- term (+ 4)
The factors are + 7 and - 3, since
7 × - 3 = - 21 and 7 - 3 = + 4, thus
(x + 7)(x - 3) = 0
Equate each factor to zero and solve for x
x + 7 = 0 ⇒ x = - 7
x - 3 = 0 ⇒ x = 3
The rule is: -2 +3
I hope this helps! Let me know if you need help with anything else!
