3 years ago

A cross-country train travels at a steady speed. It covers 15 miles in 20

Mathematics

1 answer:

skelet666 [1.2K]3 years ago

5 0

Answer:

i think its 225 but i can still be wrong

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A number plus itself, plus twice itslef, plus 4 times itself, is equal to -104. what is the number?

Nutka1998 [239]

Let's represent this unknown number with the variable 'n'
n + n + 2n + 4n = -104

Explanations:
'n+n' - a number plus itself
'+2n' - plus twice itself
'+4n' - plus 4 times itself

Anyway:
n + n + 2n + 4n = -104
Simplify:
8n = -104
Divide both sides by 8:
n = -13

The number is -13
Good luck! If you need me to explain something in more depth, just ask :))
-T.B.

8 0

3 years ago

Need help ASAP!!! Pleasee

stira [4]

f ( - 1 ) = - 8 [ approximately ]

f ( 1 ) = - 12 [ approximately ]

4 0

2 years ago

At a local print shop, 18 copies can be made for $6. At this rate, how much would it

Ber [7]

Answer: to make 78 copies it cost 26 dollars.

Step-by-step explanation:

18 copies - 6 dollars

78 copies - x dollars

Hence,

$\displaystyle\\x=\frac{78*6}{18} \\\\x=\frac{26*3*6}{3*6} \\\\x=26 \ dollars$

5 0

1 year ago

11. Find the average rate of change of the equation y = x2 + 4x + 1 on the interval -1 < x < 4.

coldgirl [10]

Answer:

31/5

Step-by-step explanation:

[f(4) - f(-1)] / 4-(-1)

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2 years ago

841 rounded to the nearest 10 and 100

LUCKY_DIMON [66]

Answer:

rounded to the nearest 10 is 840

rounded to the nearest 100 is 800

Step-by-step explanation:

6 0

2 years ago