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3 years ago

Identify the number of solutions or zeros 2x^2+5x-9=0

Mathematics

1 answer:

Anon25 [30]3 years ago

6 0

There are going to be two solutions because the "biggest" x is x^2 but you can factor to find what they actually are.

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I NEED FAST HELP!!!!!!!!!!!!!!!!!!!

Sindrei [870]

Answer:

The student is expected to spend <em>15.4 hours </em>doing homework

Step-by-step explanation:

The scattered plot shows there is a close correlation between the variables. A line of best fit will go through the 'center' of the points. Since we are not required to find an exact line, we'll draw it in red color as shown below

To know the equation of that line, we must take two clear points of it from the graph. We'll pick (28,4) and (4,25)

The equation of a line, given two points (a,b) and (c,d) is

$\displaystyle y-b=\frac{d-b}{c-a}(x-a)$

Using the selected points

$\displaystyle y-4=\frac{25-4}{4-28}(x-28)$

Simplifying and computing results, the equation is

$\displaystyle y=-\frac{7}{8}x+\frac{57}{2}$

Using that equation, we can predict how many hours the students will spend doing homework if they spend 15 hours watching TV

$\displaystyle y=-\frac{7}{8}(15)+\frac{57}{2}$ =15.4 hours

So the student is expected to spend 15.4 hours doing homework

7 0

3 years ago

3) 9i(3)+ 9i(2)+ 18i + 36

GalinKa [24]

Answer:
36+63i

explanation:

7 0

3 years ago

The area of a triangle is 20 square feet.

sdas [7]

Since the equation is A= 1/2 times base times height, I did the base as 8 and the height as 5.

8 0

3 years ago

The following data set represents the math test scores for a class of 20 students.90, 60, 85, 100, 100, 90, 100, 75, 100, 95, 95

Ede4ka [16]

The first step to identifying the central tendency of the data set is to order the scores from least to greatest, so:

15,30,40,60,70,75,80,85,85,90,90,90,95,95,100,100,100,100,100,100

Now, the mode of a data set is the value that occurs most frequently. As we can observe in this case, the mode is 100 but is at the right extreme of the set, it is not the central tendency of the data.

The formula gives the mean:

$\bar{x}=\frac{\sum_{i=1}^nx_i}{n}$

So, we need to sum all the values and divide it by the total number of values, 20:

$\begin{gathered} \bar{x}=\frac{15+30+40+60+70+75+80+85+85+90+90+90+95+95+100+100+100+100+100+100}{20} \\ \\ \bar{x}=\frac{1600}{20}=80 \end{gathered}$

As we can observe, the mean is a little bit far of the central tendency, given that the most frequent values are over 80.

Finally, let's check the median, and it is the value that is located at the center of the data set. As we have 20 values, the median will be the average value between the 10th and 11th terms, so:

10th term: 90

11th term:90

Median: 90.

It is more representative to the central tendency of the data se

3 0

1 year ago

What about part b. Part a is very clear but I still don’t understand part b.

avanturin [10]

Take a pic may be able to help

7 0

3 years ago