3 years ago

Christy drove 135 miles in 2.5 hours.what was her average speed in miles per hour

Mathematics

2 answers:

garri49 [273]3 years ago

8 0

54 miles per hour................

Trava [24]3 years ago

6 0

54 miles per hour. you divid 2.5 from both numbers because that will give you 1 hour and its miles.

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PLEASE HELP WILL GIVE BRAINLIEST

Dovator [93]

The second one is right

8 0

3 years ago

What is the value of y in this system of equations: 3x + y = 9 y = –4x + 10 ?

Ahat [919]

3x + y = 9 (I)
y = –4x + 10 (II)
------------------------
 $\left \{ {{3x + y = 9 } \atop {y = -4x + 10 }} \right.$

Pass the incognito "4x" to the first term, changing the signal when changing sides.
-------------------------
simplify by (-1)
 $\left \{ {{3x + y = 9.(-1)} \atop {4x + y = 10 }} \right.$ 

-------------------------
 $\left \{ {{- 3x - \diagup\!\!\!\!y =-9} \atop {4x + \diagup\!\!\!\!y = 10}} \right. 
$

-------------------------
 $\left \{ {{- 3x = - 9} \atop {4x = 10}} \right.$ 

-----------
 $\boxed{x = 1}$ 

Substitute in equation (I) to find the value of "Y".

3x + y = 9 (I)
3*(1) + y = 9
3 + y = 9
y = 9 - 3
$\boxed{y = 6}$

Answer:
$\boxed{\boxed{ \left \ {{x=1} \atop {y=6}} \right. }}$

6 0

3 years ago

Match the following proofs to each other. The answers there I guessed on but most likely not right. I need help. My grade is not

DanielleElmas [232]

Step-by-step explanation:

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3 years ago

Price: ? Discount: 5% Sale Price: $57

liq [111]

I just answered this.... :]

x - 0.05x = 57,
0.95x = 57,
57/0.95 = original price
Original price = $60

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4 years ago

What are the factors of 3x2 + 10x + 8?

DaniilM [7]

(3x+4) (x+2)
This gives you 3x^2 + 6x + 4x + 8
Which simplifies to 3x^2 + 10x + 8

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3 years ago