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3 years ago

Please help and if you troll ill report thanks

Mathematics

1 answer:

Georgia [21]3 years ago

3 0

y IS directly proportional to x .

The constant of proportionality is 8.62 .

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{20, 25, 19, 18, 21, 24, 15, 25} What is the mean of the data set? Make sure to show ALL of your work

katrin [286]

Answer:

20.875

Step-by-step explanation:

Mean is to add up the scores then divide by the number so 20 + 25 + 19 + 18 + 21 + 24 + 15 + 25 which is 167 then divide by 8 which is 20.875

4 0

3 years ago

Factor completely and then place the factors in the proper location on the grid a^2-a-20

Gnoma [55]

Answer:

$(x-5)(x+4)$

Step-by-step explanation:

We have the following quadratic equation

$a^2-a-20$

The factored expression will have the following form

$(x+b)(x+c)$

Where b and c are two real numbers which when added together result in -1, and multiplying them results in -20

$b*c=-20\\b+c=-1$

You can verify that the numbers that meet this condition are:

-5 and 4

Then the factors are:

$(x-5)(x+4)$

3 0

3 years ago

In a scale drawing, 3 inches<br> represents 10 miles. How many<br> inches represent 45 miles?

Neko [114]

Answer:

13.5 inches

Step-by-step explanation:

3inches:10 miles

x inches: 45 miles

do cross multiply:

3*45=135

10*x=10x

so 135=10x

x=13.5 inches

5 0

2 years ago

Read 2 more answers

Tyler and Pearl went on a 20km bike ride that lasted for 3 hours. Because of steep hills or the trail, they walked for most of t

noname [10]

Answer: 1 hour

Step-by-step explanation:

Let the distance they walked be $d_1$ in time $t_1$ and the distance they walked be $d_2$ in time $t_2$ ,then

Walking speed= $\frac{d_1}{t_1}=4$

$\\\Rightarrow\ d_1=4t_1$

Riding speed= $\frac{d_2}{t_2}=12$

$\\\Rightarrow\ d_2=12t_1$

Also the total time taken=3 hours

∴ $t_1+t_2=3\\\Rightarrow\ t_2=3-t_1$ ...(1)

Since the total distance= 20 km

∴ $d_1+d_2=20\\\Rightarrow4t_1+12t_2=20\\\Rightarrow4t_1+12(3-t_1)=20..............[\text{from (1)}]\\\Rightarrow4t_1+36-12t_1=20\\\Rightarrow-8t_1=-8\\\Rightarrow\ t_1=1$

Thus, the they spent 1 hour time in walking.

7 0

3 years ago

Easy question - giving brainly is correct and work is shown!

Ymorist [56]

Answer:

the answer is 102 pls mark brainlest

4 0

3 years ago

Please help and if you troll ill report thanks​

Please help and if you troll ill report thanks