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Helen [10]
2 years ago
10

A certain journey by train takes 5 hours at the speed of 45 km/h. What will be the speed of the train to complete the same journ

ey in 3 hours?​
Mathematics
2 answers:
Liula [17]2 years ago
3 0

A certain journey by train takes 5 hours at the speed of 45 km/h. What will be the speed of the train to complete the same journey in 3 hours?

rewona [7]2 years ago
3 0

Answer:

Journey taken time 5 hour at speed of 45km/hr

So,

 1 hour=45/5=9km/hr

Therefore,3 hour=(9x3)km/hr.


(please mark me brainliest if my answer was good)

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Which order pair is a solution to the system of linear equations -4+y=8 and x-5y=17?
andreev551 [17]

Hello!

To find this ordered pair, we solve for x and y and put them together in an ordered pair.

-4+y=8

x-5y=17

Let's solve the first equation for y.

y= 12

Now, let's plug 12 into the second equation for y.

x-5(12)=17

x-60=17

x=77

Therefore, our ordered pair is (77,12)

I hope this helps!

4 0
4 years ago
Read 2 more answers
Could someone please explain! I cant figure it out.
qwelly [4]

2^-2 = 1/2^2

so: (1/2^2)*(12*3)-5^3

simplify: (1/4)*36-125

36*(1/4) = 36/4 so: 9-125

subtract: -116

3 0
4 years ago
I need help, pls !!!
luda_lava [24]

Answer:

D) 11.2 Orange

General Formulas and Concepts:

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

  1. Brackets
  2. Parenthesis
  3. Exponents
  4. Multiplication
  5. Division
  6. Addition
  7. Subtraction
  • Left to Right

<u>Algebra II</u>

  • Distance Formula: \displaystyle d = \sqrt{(x_2-x_1)^2+(y_2-y_1)^2}

Step-by-step explanation:

<u>Step 1: Define</u>

<em>Find points from graph.</em>

Point (-8, -1)

Point (-3, 9)

<u>Step 2: Find distance </u><em><u>d</u></em>

Simply plug in the 2 coordinates into the distance formula to find distance <em>d</em>

  1. Substitute [DF]:                    \displaystyle d = \sqrt{(-3+8)^2+(9+1)^2}
  2. Add:                                      \displaystyle d = \sqrt{(5)^2+(10)^2}
  3. Exponents:                           \displaystyle d = \sqrt{25+100}
  4. Add:                                      \displaystyle d = \sqrt{125}
  5. Simplify:                               \displaystyle d = 5\sqrt{5}
  6. Evaluate:                              \displaystyle d = 11.1803
  7. Round:                                 \displaystyle d = 11.2
8 0
3 years ago
4. What is the density of an object<br> with a mass of 20g and a volume of<br> 4ml?
kow [346]

Answer:

5000 kilogram/cubic meter

Step-by-step explanation:

7 0
3 years ago
roger sells 23 necklaces at a fair a total of $ 201.25. Each necklaces is sold for the same price. what is the price of one neck
MrMuchimi

Answer:

$8.75

Step-by-step explanation:

It is given that,

Roger sells 23 necklaces at a fair a total of $ 201.25.

We need to find the price of 1 necklace. We can use unitary method to find it.

23 necklaces = $201.25.

For cost of 1 necklace, divide $201.25 by 23 as follows :

x=\dfrac{201.25}{23}\\\\=\$ 8.75

So, the cost of 1 necklace is $8.75.

4 0
3 years ago
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