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3 years ago

Find the precent of each number.

Mathematics

1 answer:

ELEN [110]3 years ago

6 0

Answer:

A.)377.6

B.)7.084

C.)1107.6

D.)680.8

Step-by-step explanation:

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15 people received an email and sent it to 3 different friends each, who in turn each sent it to 2 new people. What percent of t

pashok25 [27]

The original 15 people are 10% of the total number of people who received the mail.

Step-by-step explanation:

Given,

Number of people who received mail = 15

Mail further sent to 3 more friends;

Number of people who received mail from 15 people = 15*3 = 45 people

Number of people who received mail from 45 people = 45*2 = 90 people

Total number of people = 15+45+90 = 150 people

Now,

Percent of original people = $\frac{Number\ of\ original\ people}{Total\ number\ of\ people}*100$

Percent of original people = $\frac{15}{150}*100=10\%$

The original 15 people are 10% of the total number of people who received the mail.

Keywords: multiplication, percentage

Learn more about percentages at:

#LearnwithBrainly

8 0

4 years ago

A boy weighing blank kilograms is riding a skateboard. He’s moving at 2 meters/second and has 40 joules of kinetic energy. He do

Ira Lisetskai [31]

Answer:

His kinetic energy at the faster speed is 160 J

Step-by-step explanation:

Here in this question, we are interested in calculating the kinetic energy at the faster speed.

Firstly, we need to know the mass of the boy’s body. We can do this by using the kinetic energy formula;

Mathematically;

K.E = 1/2 * m * v^2

From the question;

K.E = 40 Joules

m = ?

v = speed = 2 m/s

Now, plugging these values into the kinetic energy equation, we have;

40 = 1/2 * m * 2^2

40 = 1/2 * m * 4

40 = 4m/2

4m = 40 * 2

4m = 80

m = 80/4

m = 20 kg

Now that we know the mass of the boy’s body, we can proceed to calculate the new K.E

Let’s follow the third statement in the question;

We were told that he doubles his speed upon sighting his friend.

Recall, he was traveling at a speed of 2 m/s.

Now doubling this means the new speed will

be 2 * 2 = 4 m/s

Now, we want to calculate the kinetic energy value at this new speed.

Mathematically, we use the same formula for kinetic energy.

K.E = 1/2 * m * v^2

We know that m is the mass that we calculated as 20kg and our v here is 4 m/s

Plugging these values, we have;

K.E = 1/2 * 20 * 4^2

K.E = (20 * 16)/2

K.E = 320/2

K.E = 160 J

6 0

3 years ago

Read 2 more answers

Let v1 = -4

just olya [345]

We're told (and we can confirm) that $v_3=2v_1-3v_2$ , so $v_3$ is a linear combination of the other two vectors.

This means <em>H</em> is sufficiently spanned by $\{v_1,v_2\}$ ; no need for the third vector.

But this also means we can write either $v_1$ as a linear combination of $\{v_2,v_3\}$ , and $v_2$ as a lin. com. of $\{v_1,v_3\}$ . So any set of these three vectors taken two at a time will span the subspace <em>H</em>. Hence all of b, c, and d are acceptable.