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3 years ago

−5(1−5k)−4(2k+5), I got this problem on khan academy and can't figure it out

Mathematics

1 answer:

ikadub [295]3 years ago

3 0

Your answer would be 1.13 repeating or no solution.

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Type the correct answer in the box. Use numerals instead of words.

Pani-rosa [81]

Answer:

Step-by-step explanation:

$7- \sqrt[3]{2-x} =12$

we have to just keep in mind to do the same operation to both sides of the equal sign

$7-7- \sqrt[3]{2-x} =12-7$ ; subtract 7 from both sides

$- \sqrt[3]{2-x} = 5$ ; multiply both sides by -1

$\sqrt[3]{2-x} = -5$ ; raise both sides to the power 3

2-x = (-5)³

2-x = -125 ; subtract 2 from both sides

-x = -125-2

-x =-127; multiply both sides by -1

x= 127

8 0

3 years ago

The ordinate is twice the abscissa

zepelin [54]

We can construct the function:

$f(x)=2x$

Where $f(x)$ or $y$ is ordinate and $x$ is abscissa.

The function actually represents a line. Since it can have linear form.

$f(x)=2x+0$

Hope this helps.

r3t40

5 0

2 years ago

A health research institute collects information from 20 individuals on the number of years they have spent smoking cigarettes,

olga55 [171]

The correlation coefficient of the health research institute data measures the relationship between the age and the years of the smokers

The correlation coefficient is 0.53

<h3>How to calculate the correlation coefficient</h3>

The correlation coefficient (r) is calculated as:

$r = \frac{n(\sum xy) - \sum x \sum y}{\sqrt{[n \sum x^2 - (\sum x)^2][n\sum y^2 - (\sum y)^2}}$

Using the given parameters, we have:

$r = \frac{20 *8249 - 1257* 116}{\sqrt{[20 * 98823 - 1257^2][20 * 836 - 116^2}}$

Evaluate the exponents

$r = \frac{20 *8249 - 1257* 116}{\sqrt{[20 * 98823 - 1580049][20 * 836 - 13456}}$

Evaluate the products

$r = \frac{164980 - 145812}{\sqrt{[1976460 - 1580049][16720 - 13456}}$

Evaluate the differences

$r = \frac{19168}{\sqrt{[396411*3264}}$

Evaluate the product

$r = \frac{19168}{\sqrt{1293885504}}$

Evaluate the root

$r = \frac{19168}{35970.6}$

Evaluate the quotient

$r = 0.53$

Hence, the correlation coefficient is 0.53

Read more about correlation coefficient at:

brainly.com/question/1564293

8 0

2 years ago

Solve the given problem. Zara is six years older than half Gary’s age. If Gary is four years old, how old is Zara?

ch4aika [34]

The answer is C. 8

4/2 = 2

2+6 = 8

Let me know if you have any questions!

7 0

3 years ago

A baker decorates 42 cupcakes in 30 minutes.She decorates cupcakes at a constant rate.

NikAS [45]

Answer:

Step-by-step explanation:

Well the way i said it was

42-30= 12

altho i not very sure

3 0

2 years ago