Answer:
50-4/25 is 49 21/25
Step-by-step explanation:
Answer:
x = all real values
Step-by-step explanation:
3(2x -5) = 6x -15
Distribute
3*2x - 3*5 = 6x-15
6x -15 = 6x -15
Subtract 6x from each side
6x-15-6x = 6x-15-6x
-15 = -15
This is always true so there are infinite solutions
x = all real values
Slope (3) y intercept (0,-2)
Answer:
6
Step-by-step explanation:
i took the test on edge
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+
)/2= 10/2 = 5
We have a negative value and a positive one
The altitude is a distance so it can't be negative
H= 5cm