Joe went to the hobby shop and bought 2 model sports cars at $8.95 each and some paints. If he spent a total of 23.65, what was
2 answers:
Answer: Cost of the paints is $5.75 only.
Step-by-step explanation:
Since we have given that
Cost of each model sports cars = $8.95
And he bought two model sports cars.
Let cost of some paint be x
Since we know that
Total money he spent = $ 23.65
Now,
According to question,
So, Cost of the paints is $5.75 only.
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Answer:
y=-1/2 x^2+3/2 x+9
Step-by-step explanation:
The equation of parabola is:
y=ax^2+bx+c
We know that parabola has three poibts
(6,0),(-3,0) and (1,10).
So we put these three points in equation:
a*36+b*6+c=0......(1)
a*9-3b+c=0........(2)
a+b+c=10........(3)
(1)-(2) we have:
27a+9b=0.....(4)
(2)-(3) we have:
8a-4b=-10.....(5)
4(4)+9(5) we got:
180a=-90
a=-1/2
From (4) we got: b=27/18=3/2
From (3) we got: c=10+1/2-3/2=9
So equation is:
y=-1/2 x^2+3/2 x+9
You can see the picture of parabola through three points.
The expected value is the mean of the overall observed value or random value. In other words, it is the average of the observed values.
The expected value, E(x) of the given observation is 185
The given parameters can be represented as:
The following formula calculates the expected value:
So, we have:
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