Answer:
[B] A two-sample t -test for a difference between means.
Step-by-step explanation:
"<u>A two sample t test for a difference in means was conducted to investigate whether the average time to swim a lap with the freestyle stroke is different from the average time to swim a lap with the butterfly stroke</u>."
Answer:
$1.75
Step-by-step explanation:
4.5-2.75=1.75
Answer:
3ab(4a + 5b)
Step-by-step explanation:
Given
12a²b + 15ab² ← factor out 3ab from each term
= 3ab(4a + 5b)
Answer:
x+6 and x+2 are factors
Step-by-step explanation:
x²+8x+12
(x+6)(x+2)
So x+6 and x+2 are factors of x²+8x+12
Gave away 7 ⇒ -7
Bought 6 ⇒ + 6
Left with 13
If he did not buy the 6 cars ...
13 - 6 = 7
If he did not give the 7 cars away ...
7 + 7 = 14
He has 14 cars at first.
13 - 6
