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Kaylis [27]
3 years ago
10

What is -23-x-x+16-2

Mathematics
2 answers:
Irina18 [472]3 years ago
7 0

Answer:

-9-2×

Step-by-step explanation:

-23-×-×+16-2

-23+14-×-×

-9-2×

iragen [17]3 years ago
4 0

Answer:-9-2x

Step-by-step explanation:

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Which expressions are equivalent to 3x + 2(x − 1) − 4?
alina1380 [7]
5x-6 is equivalent. This is because 2 (x-1) becomes 2x-2, which makes the expression 3x+2x-2-4, which when put all together becomes 5x-6.
4 0
3 years ago
According to industry sources, online banking is expected to take off in the near future. The projected number of households (in
Airida [17]

Answer:

(a) The least-square regression line is: y=4.662+2.709x.

(b) The number of households using online banking at the beginning of 2007 is 31.8.

Step-by-step explanation:

The general form of a least square regression line is:

y=\alpha +\beta x

Here,

<em>y</em> = dependent variable

<em>x</em> = independent variable

<em>α</em> = intercept

<em>β</em> = slope

(a)

The formula to compute intercept and slope is:

\begin{aligned}        \alpha  &= \frac{\sum{Y} \cdot \sum{X^2} - \sum{X} \cdot \sum{XY} }{n \cdot \sum{X^2} - \left(\sum{X}\right)^2}  \\\beta &= \frac{ n \cdot \sum{XY} - \sum{X} \cdot \sum{Y}}{n \cdot \sum{X^2} - \left(\sum{X}\right)^2}        \end{aligned}

The values of ∑<em>X</em>, ∑<em>Y</em>, ∑<em>XY</em> and ∑<em>X</em>² are computed in the table below.

Compute the value of intercept and slope as follows:

\begin{aligned}        \alpha &= \frac{\sum{Y} \cdot \sum{X^2} - \sum{X} \cdot \sum{XY} }{n \cdot \sum{X^2} - \left(\sum{X}\right)^2} =             \frac{ 68.6 \cdot 55 - 15 \cdot 218.9}{ 6 \cdot 55 - 15^2} \approx 4.662 \\ \\\beta &= \frac{ n \cdot \sum{XY} - \sum{X} \cdot \sum{Y}}{n \cdot \sum{X^2} - \left(\sum{X}\right)^2}        = \frac{ 6 \cdot 218.9 - 15 \cdot 68.6 }{ 6 \cdot 55 - \left( 15 \right)^2} \approx 2.709\end{aligned}

The least-square regression line is:

y=4.662+2.709x

(b)

For the year 2007 the value of <em>x</em> is 10.

Compute the value of <em>y</em> for <em>x</em> = 10 as follows:

y=4.662+2.709x

  =4.662+(2.709\times10)\\=4.662+27.09\\=31.752\\\approx 31.8

Thus, the number of households using online banking at the beginning of 2007 is 31.8.

5 0
3 years ago
HELPPPPPPP I WILL GIVE YOU BRAINLIEST
katovenus [111]

Step-by-step explanation:

7 X + 8 = X+12 + 3X+20

3 X = 24

X= 8

m< RPQ = 8+12 = 20

4 0
3 years ago
Which of these sets of side lengths are Pythagorean triples? Check all that apply.
yKpoI14uk [10]
Some primitive triples are ...
  (3, 4, 5)
  (5, 12, 13)
  (7, 24, 25)
  (9, 40, 41)
One interesting characteristic of these is that the sum of the last two numbers is the square of the first number.

Any multiple of these will be a Pythagorean triple.

Now consider your list.
  a) (10, 24, 26) = 2×(5, 12, 13) . . . IS a Pythagorean Triple
  b) 2×(7, 24, 25) = (14, 48, 50), so (14, 48, 49) is NOT a Pythagorean Triple
  c) 3×(3, 4, 5) = (9, 12, 15), so (9, 12, 16) is NOT a Pythagorean Triple
  d) (9, 40, 41) . . . IS a Pythagorean Triple
  e) 5×(3, 4, 5) = (15, 20, 25) . . . IS a Pythagorean Triple

The sets of side lengths that are Pythagorean Triples are ...
  (10, 24, 26)
  (9, 40, 41)
  (15, 20, 25)
7 0
3 years ago
Read 2 more answers
Daniel and Saquon are each saving money. Daniel starts with $50 in his savings account and adds $8 per week. Saquon starts with
kondor19780726 [428]

Answer:

  1. Sequon has more money after 4 weeks.
  2. It would take 5 weeks for their savings accounts to be equal.

Step-by-step explanation:

Daniel

Daniel starts with $50 and each week he adds $8. To find out the amount he has in any given week, the following formula would work:

= 50 + 8x

The x is the number of weeks and is multiplied by 8 because the amount of money he has increase by 8 every week.

After 4 weeks he would have:

= 50 + (8 * 4)

= 50 + 32

= $82

Saquon

Applying the same formula:

= 65 + 5x

After 4 weeks:

= 65 + (5 * 4)

= 65 + 20

= $85

Saquon has more money after 4 weeks.

<u>Number of weeks it would take for both of them to have the same amount.</u>

To find this out, equate both formulas and solve for x.

50 + 8x = 65 + 5x

8x - 5x = 65 - 50

3x = 15

x = 15/3

x = 5 weeks

<em>At 5 weeks they will both have:</em>

<em>50 + 8 * 5 = $90</em>

<em>65 + 5 * 5 = $90</em>

7 0
3 years ago
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