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3 years ago

What is the value of r in the equation 4r − 8 = 5r + 12? −20 −1 1 20

Mathematics

2 answers:

Montano1993 [528]3 years ago

4 0

$4r-8=5r+12\\-8-12=5r-4r\\-20=r$
Thus your answer is -20.

Readme [11.4K]3 years ago

3 0

The answer is -20. if you move all of the numbers with r to the right and all of the numbers without r to the left, you get r = -20.

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Samantha wants to know whether the food she serves in her restaurant is within a safe range of

nikitadnepr [17]

Answer: The population would be the data of temperatures of all food served by the restaurant.

Step-by-step explanation:

In a statistical study, the term population refers to the largest group of all individuals related to the study or the objective of the study.

Here, the objective of the study= To check the temperatures of food just before serving.

Population = Data of temperatures of all dishes served by restaurant.

Hence, the population would be the data of temperatures of all dishes served by the restaurant.

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2 years ago

What's the property of x ( x - 5y ) + 2y ( X - 5y)

Rasek [7]

Associative property

8 0

2 years ago

I turn 40 degrees clockwise, 70 degrees anticlockwise and

rosijanka [135]

Answer:

Anticlockwise 60°

Step-by-step explanation:

Let my starting point be 0°

Turning to the right(clockwise)40° = 0° + 40° = 40°

I am now at 40° to the right of my starting point.

Turning to the left(anticlockwise) 70° = 40° - 70° = -30°

I am now 30° to the left of my starting point.

Turning to the right 90° = -30° + 90° = 60°

I am 60° to the right of my starting point.

To go back to the startoing point(0°), I should go to the left(anticlockwise) by 60°

This is a change of -60°

-Chetan K

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2 years ago

TRUE OR FALSE?<br> -7 = (-5) - (-12)

gizmo_the_mogwai [7]

Answer:

false

Step-by-step explanation:

-7=(-5)-(-12)

-7=-5+12

-7=7 is not true

5 0

2 years ago

Read 2 more answers

Determine the number of terms n in each geometric series.<br> 13) a1 = 0.75, r = 4, Sn =1023.75

Gnom [1K]

Answer:

Number of terms: n=6

Step-by-step explanation:

We are given:

a₁ = 0.75

r = 4

Sₙ = 1023.75

We need to find number of terms i.e n

The formula used will be: $S_n=\frac{a(r^n-1)}{r-1}$

Putting values and fining n

$S_n=\frac{a(r^n-1)}{r-1}\\1023.75=\frac{0.75(4^n-1)}{4-1}\\ 1023.75=\frac{0.75(4^n-1)}{3}\\3\times 1023.75=0.75(4^n-1)\\3071.25=0.75(4^n-1)\\4^n-1=\frac{3071.25}{0.75}\\4^n-1=4095\\4^n=4095+1\\4^n=4096$

We know that $4^6= 4096$

$4^n=4^6$

Using Exponent rule: $a^n=a^b => n=b$

$n=6$

So, Number of terms: n=6

5 0

3 years ago