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3 years ago

What two numbers add up to 10 and multiply to 21

Mathematics

1 answer:

WITCHER [35]3 years ago

3 0

Answer:The answer is 3 & 7

Step-by-step explanation:3 x 7 = 21

3 + (7) = 10

Are you asking because you are trying to figure out how to factor the following quadratic equation?

x2 + 10x + 21 = 0

If so, the solution to factor the quadratic equation above is:

(X + 3 ) (X + 7)

To summarize, since 3 and 7 multiply to 21 and add up 10, you know that the following is true:

x2 + 10x + 21 = (X + 3 ) (X + 7)

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Help pls ????????!!!!!!

7nadin3 [17]

Answer:

let the number of steps taken by friend 1, 2 and 3 be: x, y and z respectively

we know that the mean of the total steps taken by all the friends is 10,350

Since the formula for mean is: sum of all values / number of values

here, the total values is the total number of steps taken

So,

steps taken by friend 1 +steps taken by friend 2 +steps taken by friend 3 +steps taken by friend 4 +steps taken by friend 5 +steps taken by friend 6

all that divided by 6 will give us the mean

so, 7800 + 8000 + 9800 + x + y + z / 6

(25600 + x + y + z)/6 = 10350

25600 + x + y + z = 10350 * 6

x + y + z = 62100 - 25600

x + y + z = 36500

So since the sum of x, y and z is 36500,

we can say that the average value of x , y and z is 12167 (36500/3)

So the next thing to make an equation out of is Median

to find the median, we need to arrange the values in any order you like, i will arrange in descending order

so since the estimated value of all x , y and z is greater than the greatest known value:

x > y > z > 9800 > 8000 > 7800

Since this set of values has an even number of values, we will take the average of the middle 2 values as the median

(9800 + z)/2 = 10000

9800 + z = 20000

z = 10200 -------- we have found one of the three values! getting closer

Now, the final equation will be found from the range

since we already have sorted our data, and the difference of the highest and lowest is the range

x > y > z > 9800 > 8000 > 7800

So, x - 7800 = 7500

x = 15300 ------- now that we have x and z, we can use the first equation to find the value of y and we will be done!

x + y + z = 36500

replacing the values

15300 + y + 10200 = 62100

y = 36500 - 25500

y = 11000

So the three remaining friends walked

15300, 11000 and 10200 steps

6 0

2 years ago

Mason breaks on average 1.5 pencils each day. How many pencils will he break in a school week?

Monica [59]

Answer:

how long is the school week??

5 0

3 years ago

Read 2 more answers

What is 33.8 divided by 32.5

Sindrei [870]

Answer:

33.8/ 32.5 = 1.04

6 0

3 years ago

The shape in the figure is constructed from several identical squares. If the side of each square is 1 unit, what is the area an

Katen [24]

Answer:

Area = 7 square units

Perimeter = 14 units

Step-by-step explanation:

The shape is made up of 7 identical squares and, we are told the side length of each square is 1 unit.

==>Find area of the shape by calculating the area of 1 square, then multiply by the number of square used in the construction.

Thus, area of 1 square = s² = 1² = 1 square units.

Area of shape = 7 × 1 square units = 7 square units

==>Find the Perimeter of the shape by adding all the lengths of the boundary formed by the square to make up the shape.

(Check attachment to understand how we got the measurement of the boundary)

The perimeter = 1 + 1 + 1 + ½ + ½ + 1 + 1 + 1½ + ½ + 1 + 1 + 4 = 14 units

8 0

2 years ago

URGENT] What is the perimeter of the figure? 28 m 22 m 20 m 14 m

Jet001 [13]

The perimeter of given figure is 20 meters.

Step-by-step explanation:

Given lengths of shape are;

3m, 4m, 7m, 1m, 5m

We have to find the perimeter of the shape.

A perimeter is the length of outline or boundary of any shape.

Perimeter of the shape = Sum of lengths

Perimeter of the shape = $3+4+7+1+5$

Perimeter of the shape = 20 meters

The perimeter of given figure is 20 meters.

Keywords: addition, perimeter

Learn more about addition at:

#LearnwithBrainly

8 0

3 years ago