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irakobra [83]
3 years ago
10

7. Mahmoud runs to a marker and back in 15 minutes. His speed on

Mathematics
1 answer:
blsea [12.9K]3 years ago
3 0

Answer:

2000 meters

Step-by-step explanation:

From the above question

Total time = 15 minutes

Converting minutes to seconds

1 minute = 60 sec

15 minutes = x

Cross Multiply

x = 60 × 15 = 900 seconds

Hence, 900 seconds = Total time

Total time = Time to the marker + Time from the marker

From the question, we are given the Speed to the marker = 5 m/s

Speed from the marker = 4 m/s

Time = Distance/speed

Let the distance be represented by x

Hence:

x/4 + x/5 =900

Multiply all through equation by Lowest Common Denominator = 20

5x + 4x= 900×20

9x = 900 ×20

Divide both sides by 9

9x/9 = 900 × 20/9

x = 2000 meters

Therefore, the total distance to the marker = 2000 meters

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The perimeter of an isosceles triangle is 15.6m. Find the lengths of its sides, if:
agasfer [191]

Answer:

so length of sides is 6 .2 m ( other side will also be 6.2 m)

base = 3.2 cm

Step-by-step explanation:

solution

let the length of sides of isosceles triangle is = x

as two sides of  of isosceles triangle are equal

let the length of the side be x

so length of side = x

base  = x -3 ( as it is 3 m smaller in length )

according to formula of perimeter of isosceles triangle

perimeter = 2 (side) + Base

adding the values  

15.6  = 2 (x) + x-3

15.6 = 2x +x -3

15.6 = 3x-3

15.6 = 3( x-1) taking 3 common

dividing both sides by 3

15.6/3 = 3(x-1)/3

5.2  =x-1

or x -1 = 5.2

adding 1 from both sides

x-1 +1 = 5.2 +1

x = 6.2

so length of sides is 6 .2 m ( other side will also be 6.2 m)

base = x-3 = 6.2-3 = 3.2 m

please mark me as brainliest

3 0
3 years ago
3/12+ = 7/12 as a faction <br><br> please help me
ohaa [14]

Answer:

10/12 or simplified its 5/6

Step-by-step explanation:

3+7 = 10

you keep the 12

10÷2 = 5

12÷2=6

common denominator

6 0
4 years ago
2. Tamika is on page 20 of her book and reads 4 pages every night. Mark is on page 30 of the same book
Dmitry [639]

Answer:

7 nights

Step-by-step explanation:

Tamika:          Mark:

20                   30

24                   32

28                   34

32                   36

36                   38

40                   40

44                   42

48  

52  

56  

60  

6 0
3 years ago
Use the table to answer the question.
Vesna [10]

Given:

The table of values of a linear relationship.

x        y

-1       -1

0       1

1        3

2       5

To find:

The equation for the given table of values.

Solution:

If a linear function passes through the two points, then the equation of the linear relationship is

y-y_1=\dfrac{y_2-y_1}{x_2-x_1}(x-x_1)

Consider any two point from the given table. Let the two points are (-1,-1) and (0,1). So, the equation of the linear relationship is

y-(-1)=\dfrac{1-(-1)}{0-(-1)}(x-(-1))

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y+1=\dfrac{2}{1}(x+1)

y+1=2(x+1)

Using distributive property, we get

y+1=2(x)+2(1)

y+1=2x+2

Subtracting 1 from both sides, we get

y+1-1=2x+2-1

y=2x+1

Therefore, the required equation is y=2x+1. Hence, the correct option is D.

5 0
3 years ago
Another virus starts spreading on July 1st, 2020. No one
sdas [7]

Answer:

1000÷11=90.9

So,29th September

3 0
3 years ago
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