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Anestetic [448]
3 years ago
9

How many real roots does a quadratic equation have if the discriminant is 10

Mathematics
1 answer:
VLD [36.1K]3 years ago
3 0

Answer:

2

Step-by-step explanation:

if the discriminant of the quadratic equation is 10 then it will have 2 real roots.

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Accountants at the Tucson​ firm, Larry​ Youdelman, CPAs, believed that several traveling executives were submitting unusually hi
77julia77 [94]

Answer:

a) Y= 90 +46.50(5) +0.35 (340) =441.50

b) The accountant should not question the voucher as the request is much higher than expected.

c) We can add the following variables

d) The percentage of variation in the trip cost that can be explained by the model​ = (0.64)^2 =0.4096 or 40.96%

A. Type of travel (air/car)

B. Gender of the executive (male/female)

The last option is not too important since we are analyzing the traveling executives not the type of business

Step-by-step explanation:

Part a

For this case we have the multiple regression model given by:

Y= 90 +46.50 x_1 +0.35 x_2

Where x_1 represent the number of days on the road and x_2 the distance traveled in miles.

And we want to find the expected amount from a 340​-mile trip that took her out of town for 5 ​days, so we just need to replace x1= 5 and x2=340 and we got:

Y= 90 +46.50(5) +0.35 (340) =441.50

Part b

The expected value taking in count that x1 = 5 and y = 340 is:

Y= 90 +46.50(55) +0.35 (340) =441.50

And the difference from the obtained value is : 685-441.50=243.5

So then the correct answer would be:

The accountant should not question the voucher as the request is much higher than expected.

Part c

We can add the following variables

A. Type of travel (air/car)

B. Gender of the executive (male/female)

The last option is not too important since we are analyzing the traveling executives not the type of business

Part d

The correlation coefficient is a "statistical measure that calculates the strength of the relationship between the relative movements of two variables". It's denoted by r and its always between -1 and 1.

The coefficient of determination "is a measure used in statistical analysis that assesses how well a model explains and predicts future outcomes. It is indicative of the level of explained variability in the data set".

The percentage of variation in the trip cost that can be explained by the model​ = (0.64)^2 =0.4096 or 40.96%

6 0
3 years ago
What is a standard procedure for dividing by a two-digit divisor?explain
nikklg [1K]

Two-Digit Divisor in Long Division. Two-Digit Divisor in Long Division. This is a complete lesson with examples and exercises about two-digit divisor in long division, meant for initial teaching in 5th grade.

7 0
3 years ago
The sum of a rational number and an irrational number equals.
VashaNatasha [74]

Answer:

I think D. but I'm not sure

7 0
3 years ago
Read 2 more answers
Write an equation that passes through the points (0,-5) and (8,-5)
bezimeni [28]

Answer:

Equation of the line: y = -5.

Step-by-step explanation:

Let (x_0,\, y_0) and (x_1,\, y_1) denote the coordinates of these two points, respectively.

Calculate the slope m of this line:

\displaystyle m = \frac{y_1 - y_0}{x_1 - x_0} = \frac{(-5) - (-5)}{8 - 0} = 0.

Notice that the slope is zero because the two points have the same y-coordinates (y_0 = y_1 = -5) even though their x-coordinates are distinct (x_0 \ne x_1.)

Equation for this line in point-slope form:

y - y_0 = m\, (x - x_0).

y - (-5) = 0\, (x - 0).

Rewrite and simplify to obtain the equation of this line in slope-intercept form:

y = -5.

The x-term was eliminated because the slope was zero.

6 0
2 years ago
Desperately need help and an explanation so I can do it on my own later.
Mashutka [201]

Step-by-step explanation:

since the sumation of f(x) of a probability is 1

thw probability to win is o.5 and to lose is o.5 so expected value is xf(x

your expected value will b 0.5 multiply by 5 thats is 2.5 thats your expected gain

4 0
1 year ago
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