Answer:
5 and -5 (±5)
Step-by-step explanation:
x²-8=17
x²=25
√x²=√25
x=±5
80% of 80=80/100 times 80=6400/100=64
answer is 64
Answer:
see below
Step-by-step explanation:
y = a ( x-0)^2 + 5 sub in the point given to calculate 'a'
1 = a (4)^2 + 5
-4 = 16a
a = - 1/4
y = -1/4 x^2 + 5
Answer:
f=
−2x^2+y
/10x+20
Step-by-step explanation:
Let's solve for f.
y=2x^2+5(x+2)f(2)
Step 1: Flip the equation.
10fx+2x^2+20f=y
Step 2: Add -2x^2 to both sides.
10fx+2x^2+20f+−2x^2=y+−2x^2
10fx+20f=−2x^2+y
Step 3: Factor out variable f.
f(10x+20)=−2x^2+y
Step 4: Divide both sides by 10x+20.
f(10x+20)
/
10x+20
=
−2x2+y
10x+20
We can form two equations, let the price of a senior ticket be s and the price of a child ticket be c.
We have from day 1:
A: 3s + 9c = 75
And from day 2:
B: 8s + 5c = 67
Now we can rewrite A as:
A: 24s + 72c = 600
And can rewrite B as:
B: 24s + 15c = 201
Now A-B can be written as:
A-B: 57c = 399
So c = 7
Now substituting this back into A we get:
A: 3s + 63 = 75
A: 3s = 12
So s = 4
We have the price of a senior ticket is $4 and the price of a child ticket is $7