Ask question

Ask question

All categories

3 years ago

9

the sum of the speeds of two trains is 720.2 mph. if the speed of the first train is 7.8 mph faster than the second train, find

the speeds of each.

1 answer:

Allushta [10]3 years ago

6 0

Answer: 1st train = 364 mph, 2nd train = 356.2

Step-by-step explanation:

Train 1: x + 7.8

Train 2: x

Train 1 + Train 2 = Sum

x + 7.8 + x = 720.2

7.8 + 2x = 720.2

2x = 712.4

x = 356.2

Train 1: x + 7.8

= 356.2 + 7.8

= 364

You might be interested in

17 - 2n = 9 what’s the answer ?

BlackZzzverrR [31]

Step 1: Simplify both sides of the equation.

17−2n=9

17+−2n=9

−2n+17=9

Step 2: Subtract 17 from both sides.

−2n+17−17=9−17

−2n=−8

Step 3: Divide both sides by -2.

−2n−2=−8−2

n=4

8 0

3 years ago

Hep me on this please

Alona [7]

Answer:

The answer is 2240m².

Step-by-step explanation:

Given that the formula of area of trapezium is A = 1/2×(a+b)×h where a and b represents the length and h is height :

$area = \frac{1}{2} \times (a + b) \times h$

$let \: a = 50 \\ let \: b = 90 \\ let \: h = 32$

$area = \frac{1}{2} \times (50 + 90) \times 32$

$area = \frac{1}{2} \times 140 \times 32$

$area = 70 \times 32$

$area = 2240 \: {m}^{2}$

5 0

3 years ago

Read 2 more answers

A typical human stomach can hold up to 4 cups of food. Write an inequality to represent how many cups of food a stomach can hold

Ede4ka [16]

5cups \= 4 cups

5 represents the amount of food held in the stomach and 4 represents the amount of food that can be held in the stomach

7 0

3 years ago

Please answer correctly !!!!! Will mark brainliest answer !!!!!!!!!!

AnnZ [28]

Answer:

type 2 in the first box,

13/4 in the second box, and

-9/8 in the third one

Step-by-step explanation:Notice that you are asked to write the following quadratic expression in vertex form, so you need to find the "x" value of the vertex, and then the "y" value of the vertex:

$x_{vertex}= -b/2a$

Which in our case is: -13/4

and the value of the y for the vertex is obtained using the functional expression when x equals -13/4:

$f(-13/4)= -9/8$

Then your expression for this quadratic should be:

$f(x)=2\,(x+\frac{13}{4} )^2+(-\frac{9}{8})$

Then type 2 in the first box, 13/4 in the second box, and -9/8 in the third one

7 0

3 years ago

Please help with these ones okay

bija089 [108]

Answer:

D, I don't know, and 1 + 3

Step-by-step explanation:

D I'm not 100% sure on, 2 I have no clue, and the third is just swapping the signs because you are flipping over the axis. I hope I could help you!

6 0

3 years ago