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2 years ago

Help help help help math

Mathematics

2 answers:

Sholpan [36]2 years ago

6 0

Answer:

Step-by-step explanation:

Sub x=2, y = 1

2(x) + y = 5

2(2) + 1 = 5

lidiya [134]2 years ago

3 0

Answer:

Step-by-step explanation:

2x+y

=2(2)+1

=4+1

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Calculate the value of the sample variance. Round your answer to one decimal place. 9_5,9_5,2,9_5

Ugo [173]

Answer:

$s^2 = 0.01$

Step-by-step explanation:

Given

Values: 9/5, 9/5, 2, 9/5

Required

Calculate the sample variance

Sample variance is calculated using:

$s^2 = \frac{\sum (x_i - \overline x)^2}{n - 1}$

First, we calculate the mean

$\overline x = \frac{\sum x}{n}$

$\overline x = \frac{9/5 + 9/5 + 2 + 9/5}{4}$

$\overline x = \frac{7.4}{4}$

$\overline x = 1.85$

$s^2 = \frac{\sum (x_i - \overline x)^2}{n - 1}$ becomes

$s^2 = \frac{(9/5 - 1.85)^2+(9/5 - 1.85)^2+(2 - 1.85)^2+(9/5 - 1.85)^2}{4 - 1}$

$s^2 = \frac{(-0.05)^2+(-0.05)^2+(0.15)^2+(-0.05)^2}{4 - 1}$

$s^2 = \frac{0.0025+0.0025+0.0225+0.0025}{3}$

$s^2 = \frac{0.03}{3}$

$s^2 = 0.01$

<em>Hence, the variance is 0.01</em>

5 0

3 years ago

In which pair of numbers is the first number of the multiple of the second number?

irina1246 [14]

Your answer would be c. 18,6

7 0

3 years ago

Answer correctly and Match it.

bezimeni [28]

1) -10,-2
2) -13,-3
3) 2,2
4) -5,3

4 0

3 years ago

Hey can you please help? I am struggling a lot don’t know how to solve this

Ket [755]

Answer:

64.8

Step-by-step explanation:

Pythagoreon Theroem

a^2 + b^2 = c^2 in this situation it would actually be the opposite, seeing where the "x" is (on a leg) c^2 - b^2 = a^2. First take the square of 67 and 17

67 squared is 4489 and 17 squared is 289 then subtract both results

4489-289 = 4200 take the square root of this number

64.8074 (Round to the tenths 64.8)

8 0

3 years ago

Final Exam 7/28/21

-Dominant- [34]

Answer:

x^3-8x^2-5x+84

Step-by-step explanation:

The polynomial can be found by expanding (x+3)(x-4)(x-7)=x^3-8x^2-5x+84

6 0

3 years ago