Evaluate the expression. 2x – 19, when x = –11 3 –41 –3 41

1 answer:

3 0

Substitute (-11) in for x. You will get 2(-11)-19. Then, use the order of operations to get -22-19=
-41.
Hope that helps!

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The table shows the ages and heights of students

Marina CMI [18]

Answer:

Correlation coefficient = 0.945 ( approx) and weight of a student increases as the height of the student increases.

Step-by-step equation:

Here, value of x are 58, 59, 60, 62, 63, 64, 66, 68, 70

Value of y are, 122, 128, 126, 133, 145, 136, 144, 150, 151.

∑x = 570, ∑y= 1236, ∑ = 36234, ∑ = 170694

∑xy=78617

Thus the correlation coefficient,

Where n is the number of the term.

here n = 9

thus, correlation coefficient

r = 

Thus, r= 0.94452987512

Which is closed to 0.95 and greater than 1

Therefore, weight of a student increases as the height of the student increases.

3 0

2 years ago

Count the possible combinations of 2 numbers chosen from the list 99 98 97 96 95 94 93 92 91

german

The number of ways to choose r objects out of n objects is:
C(n,r) = (n!)/(r! * (n-r)!)

The number of ways to choose 2 numbers out of a list of 9 numbers is:
C(9,2) = 9! / (2! * 7!)
= 9*8 / 2!
= 9*8/2
= 36

Here are all the possible combinations:
98 97
98 91
98 93
98 99
98 96
98 94
98 92
98 95
97 91
97 93
97 99
97 96
97 94
97 92
97 95
91 93
91 99
91 96
91 94
91 92
91 95
93 99
93 96
93 94
93 92
93 95
99 96
99 94
99 92
99 95
96 94
96 92
96 95
94 92
94 95
92 95

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4 years ago

How do you solve 9 7/8 divided by 5 2/3? Explain how you used math to determine your answer.

Yanka [14]

Answer:

Change the mixed fractions to improper fractions
For any fraction in the form $A\frac{b}{c}$ is equal to $\frac{(A*b)+c}{b}$
so the fractions are $\frac{79}{8}$ and $\frac{17}{3}$
Then in order to divide, change the fraction on the right by flipping it, and then multiply everything
$\frac{79}{8} \div\frac{17}{3}=\\\frac{79}{8} \times\frac{3}{17} =\frac{1343}{24}$