-12x + 2 = -22 How do you do this?
1 answer:
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Answer:
The amount in checking will always be twice in any week.
Step-by-step explanation:
Let's say, represents the week,
represents the saving account and
represents the checking account.
Balance in saving account in any week
Balance in checking account in any week
Translate the statement into mathematical equation. Remember to use " = " for word "is" in the given statement.
We have to find for
.
Putting the values, we have:
Which means in each week the amount in checking is twice the amount in savings.
Best Regards!
Answer:
5 cm
Step-by-step explanation:
We khow that the altitude of this triangle is 1cm shorter than the base
- Let H be our altitude and B our base and A the area of the triangle
- A= (B*H)/2 ⇒ 15=(B*H)/2
- H is 1cm shorter than B ⇒ B=H+1
- H*(H+1)/2=15 ⇒ H*(H+1)=30⇒ H²+H=30⇒H²+H-30+0
that's a quadratic equation . Let's calculate the dicriminant .
Let Δ be the dicriminant
- a=1
- b=1
- c= -30
- Δ=b²-4*a*c = 1²-4*1*(-30)=1+4*30=121≥0
- Δ≥0⇔ that we have two solutions x and y
- x= (-1-
)/2= (-1-11)/2= -6
- y= (-1+
We have a negative value and a positive one
The altitude is a distance so it can't be negative
H= 5cm