Answer:
24 years old
Step-by-step explanation:
Let the age of Blake be x and the age of Heather by y then...
x=7+y
7+x+7+y=55
Notice we are adding additional 7s because the question states "in 7 years"
Simplify the second equation...
7+x+7+y=55
14+x+y=55
Subtract 21 from both sides
x+y=41
Solve using substitution (substitute 7+y for x since x = 7+y)
7+y+y=41
Combine like terms
2y+7=41
Subtract 7 from both sides
2y=34
Divide both sides by 2
y=17
x=7+17=24
Blake is 24 years old now
Answer:
B.
Step-by-step explanation:
Answer:
A. =
Step-by-step explanation:
Find a common denominator, then compare.
Answer:
"0.0373" seems to be the appropriate solution.
Step-by-step explanation:
The given values are:
n₁ = 43
n₂ = 35
Now,
The test statistic will be:
⇒ 
On substituting the given values in the above formula, we get
⇒ 
⇒ 
⇒ 
⇒ 
then,
P-value will be:
= 
= 
Answer:
5
Step-by-step explanation:
20-15 = 5
