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DENIUS [597]
3 years ago
11

Which statement is true ? Help plzzzz

Mathematics
1 answer:
Zarrin [17]3 years ago
7 0

Answer:

Correct choice is B

Step-by-step explanation:

The quadratic function g(x) has equation g(x)=ax^2+bx+c. Find values of a, b and c:

g(0)=2=a\cdot 0^2+b\cdot 0+c\Rightarrow c=2.

g(2)=3=a\cdot 2^2+b\cdot 2++2\Rightarrow 4a+2b=1.

g(4)=2=a\cdot 4^2+b\cdot 4+2\Rightarrow 16a+4b=0.

From the last equation b=-4a and 4a-8a=1,\\ \\a=-\dfrac{1}{4},\\ \\b=1.

The equation of the quadratic function g(x) is

g(x)=-\dfrac{1}{4}x^2+x+2. This quadratic function determines the parabola with vertex at point (3,2). Thus,

1. The maximal value of f(x) is 4 at x=2.

2. The maximal value of g(x) is 3 at x=2.

Thus, the maximal value of f(x) is greater than the maximal value of g(x). So option B is correct.

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2 years ago
A set of piano prices distributed at a mean of 3000 and a standard deviation of 200 dollars. An electric piano has a price of 25
lana [24]

Answer:

The proportion of piano prices higher than the electric piano is 98.3%

Step-by-step explanation:

The first thing to do here is to calculate the standard score of the price of the electric piano given.

Mathematically, this is

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where mean is 3000 and SD is 200, x is 2576

z-score = (2576-3000)/200 = -2.12

Now we proceed to calculate the probability of this z-score

The probability we are trying to calculate is

P( x > $2576) or simply P ( z > -2.12)

Using standard score probability calculator or table, we have

P(x>2576) = 1 - P(x<2576)

But, P(x<2576) = 0.017003

P(x>2576) = 1 - P(x<2576) = 0.983

This is same as 98.3%

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