All categories

3 years ago

Please help. 60 points.

Mathematics

1 answer:

hram777 [196]3 years ago

5 0

Answer:

a)15 b)15 c)same

Step-by-step explanation:

as shown on the pictures above, that carl and luos reciev same salary at the same time

You might be interested in

Jonathans parents told him that for every 5 hours of homework or reading he completes he will be able to play 3 hours of video g

TEA [102]

Jonathan get more hours because if him and lucks do 5 hours of homework Jonathan will play 3hours and luckas will play 2.5hours

4 0

2 years ago

Evaluate the expression for x = 5, y = 3, and z = 14 . 5x−6y+20z over 4yz Enter your answer in the box.

spin [16.1K]

Hello from MrBillDoesMath!

Answer: 1 17/24

Steps:

Evaluate (5x-6y+20x)/ 4yz when x = 5, y = 3, z = 14

(5(5) - 6(3) + 20(14)) / 4 (3)(14) (Substitute in values)

= (25 - 18 +280) / 4 (3) (14) (Evaluate products)

= (287) / 4 (3) (14) (Evaluate expressions)

= 287/ 168 (4 (3)(14) = 168)

= (168 + 119 ) /168 287 = 168 + 119

= (168)/168 + 119/168

= 1 + 119/168

= 1 119/168

BUT 119 = 17 * 7 (surprise!) and 168 = 12 * 7 * 2 so answer

= 1 (17*7)/(12*7*2)

= 1 (17)/(12*2) (Cancel 7's)

= 1 (17/24)

Regards, MrB

3 0

2 years ago

Professor Isaac Asimov was one of the most prolific writers of all time. Prior to his death, he wrote nearly 500 books during a

svp [43]

Answer:

Step-by-step explanation:

n = sample size = 5

a) Let us determine the sum

$\sum x_i= 100+200+300+400+490=1490$

$\sum x_i^2= 100^2+200^2+300^2+400^2+490^2=540100$

$\sum y_i = 237+350+419+465+507=1978$

$\sum y_i^2= 237^2+350^2+419^2+465^2+507^2=827504$

$\sum x_i y_i=100 \times 237 + 200\times350+300 \times 419 + 400 \times 465 + 490 \times 507=653830$

Now we can determine $S_x_x, S_x_y, S_y_y$

$S_x_x = \sum x_i^2-\frac{(\sum x_1)^2}{n} \\= 540100 - \frac{1490^2}{5} \\= 96080$

$S_x_y = \sum x_i y_i -\frac{(\sum x_i)(\sum y_i) }{n} \\\\$

$653830 - \frac{1490 \times 1978 }{5} = 64386$

$S_y_y = \sum y_i^2-\frac{(\sum y_i)^2 }{n} = 82750-\frac{1978^2}{5} \\\\= 45007.2$

The estimate b of the slope β is the ratio of $S_x_y$ and $S_x_x$

$b = \frac{S_x_y}{S_x_x}$

$\frac{64386}{96080} = 0.67$

The mean is the sum of all value divide by number of values

$\bar x= \frac{\sum x_i}{n} \\\\= \frac{100+200+300+400+490}{5} \\\\= \frac{1490}{5} = 298$

$\bar y= \frac{\sum y_i}{n} \\\\= \frac{237+350+419+465+507}{5} \\\\= \frac{1978}{5} = 395.6$

The estimate a of the intercept is

$a = \bar y - b \bar x$

$= 395.6 - 0.69 \times 298\\= 195.9$

General least square equation;

$\bar y = \alpha + \beta x$

replace alpha by a = 3 and beta by b = 0.67 in general least equation

y = a + bx

195.9 + 0.67x

Scatter plot is shown in the attached file

x is on the horizontal axis

y is n the vertical axis

The degree of freedom of regression is 1

because we use one variable s predictor variable

$d_f_R = 1$

The degree of freedom of error is the sample size n decrease by 2

$d_f_E =n-2= 5 - 2=3$

Total df is equal to the sum of seperate degree of freedom dfR and dfE

total df = 1 +3 4

$SSR = \frac{(S_x_y)^2}{S_x_x} = \frac{64386^2}{96080} \\\\= 43146.9296$

Total SS =Syy= 45007.2

SSE + Total SS = SSR

= 45007.2 - 43146.9296

= 1860.2705

7 0

3 years ago

What is the measure of angle BCD? A. 25º B. 40º C. 140º D. 155º

Rom4ik [11]

C. 140 (mb) ..............

6 0

3 years ago

Read 2 more answers

Calculate the length of the third side of this triangle. 6 cm, 8 cm

stiv31 [10]

<h2>By pythagoras theoram </h2>

 $c = \sqrt{a2 + b2}$ 

6²-- 8²

18--16

2 

Hence the third value 2 

Step-by-step explanation:

I think this is a helpful for you 

7 0

2 years ago