21q - 4v - 8q + q - v
you simplify the expression pretty much
14q - 5v is your answer
hope this helps
Answer:
7
Step-by-step explanation:
4 times at an addition of 4, then a subtraction of 12
The answer is <span>b.3x + 15 = 55 - x
</span>
x - Jill's present age
y - dad's present age
<span>In 5 years, Dad will be three times as old as his daughter Jill will be then:
y + 5 = 3(x + 5)
</span><span>The sum of their present ages is 50:
x + y = 50
We have the system of two equations now:
</span>y + 5 = 3(x + 5)
x + y = 50
Let's rearrange the second equation:
If: x + y = 50
Then: y = 50 - x
Now, substitute y from the second equation (y = 50 - x) into the first one:
y + 5 = 3(x + 5)
50 - x + 5 = 3(x + 5)
50 + 5 - x = 3*x + 3*5
55 - x = 3x + 15
Rearrange it a bit:
3x + 15 = 55 - x
Therefore, the correct choice is b.
Answer:
the probability that Christine fails the course is 0.425
Step-by-step explanation:
A = Christine fails the course
B = Christine finds a tutor at such short notice
P(B) = 0.75
P(A|B) = 0.35
P(A|B') = 0.65
by total probability theorem
P(A) = P(A∩B) + P(A∩B')
by definition of intersection probability
P(A) = P(A|B)P(B) + P(A|B') P(B') = 0.35*0.75 + 0.65*(1-0.75)=0.425
