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2 years ago

An equation was used to predict possible sales of phones for 6 months. The actual sales of phones are also listed.

Mathematics

2 answers:

Grace [21]2 years ago

5 0

Answer with Step-by-step explanation:

Residual is calculated by the difference between actual value and the predicted value.

Actual sales Predicted sales Residual

55 40 15

150 150 0

325 300 25

510 500 10

780 800 -20

990 1000 -10

Sum of residuals=15+0+25+10-20-10

=20

Hence, sum of residuals is:

LekaFEV [45]2 years ago

3 0

They were up 15+0+25+10-20-10=20. The sum was 20 :)

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Click the "draw structure" button to launch the drawing utility. Propane (CH3CH2CH3) has both 1° and 2° hydrogens. Draw the carb

Hoochie [10]

Answer:

Step-by-step explanation:

The carbon radical formed by homolysis of a 1° C―H bond and a 2° C―H bond in propane is as shown in the attached file.

8 0

2 years ago

Train A traveled 173 miles in five hours. For Train B, y = 31.35x represents its rate of speed over the same five hours. Which t

kap26 [50]

D) Train A by a factor of 1.1
Train A: 17/35 = 34.6

Train B: Rate is the slope of the equation, 31.35

Thus,34.6/31.35 = 1.1036

4 0

2 years ago

Read 2 more answers

If 2x2 + y2 = 17 then evaluate the second derivative of y with respect to x when x = 2 and y = 3. Round your answer to 2 decimal

Vera_Pavlovna [14]

Answer:

y''=-1.26

Step-by-step explanation:

We are given that $2x^2+y^2=17$

We have evaluate the second order derivative of y w.r.t. x when x=2 and y=3.

Differentiate w.r.t x

Then , we get

$4x+2yy'=0$

$2x+yy'=0$

$yy'=-2x$

$y'=-\frac{2x}{y}$

Again differentiate w.r.t.x

Then , we get

$2+(y')^2+yy''=0$ $(u\cdot v)'=u'v+v'u)$

$2+(y')^2+yy''=0$

Using value of y'

$yy''=-2-(-\frac{2x}{y})^2$

$y''=-\frac{2+(-\frac{2x}{y})^2}{y}$

Substitute x=2 and y=3

Then, we get $y''=-\frac{2+(\frac{4}{3})^2}{3}$

$y''=-\frac{18+16}{9\times 3}=-\frac{34}{27}$

Hence,y''=-1.26

6 0

2 years ago

Express 25.6 nanometres in metres, giving your answer in standard form.

zhannawk [14.2K]

Answer:

10 to power of -8 so 0.00000001 I think

8 0

2 years ago

Rayna is building a tapered staircase using wooden boards. The bottom stair is 3 ft wide, and the top stair is 2 ft wide. Each s

Oksana_A [137]

Answer:

Total length of wooden boards = 10 feet

As 10 is a whole number, it can't be written as an improper fraction.

Step-by-step explanation:

First we need to convert the 4 in measurement to foot.

The conversion rate is: 12 inches = 1 foot.

So we have that 4 inches is equal to 1/3 feet.

If each stair is (1/3) feet shorter than the one below, we have that:

Bottom stair = 3 feet

Second stair = 2.666 feet

Third stair = 2.333 feet

Top stair = 2 feet

The staircase have 4 stairs:

3 feet, 2.666 feet, 2.333 feet and 2 feet

Now, to know the total length of wooden boards, we just need to sum the length of each stair:

Total = 3 + 2.666 + 2.333 + 2 = 10 feet

As 10 is a whole number, it can't be written as an improper fraction.

3 0

2 years ago