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AlexFokin [52]
3 years ago
8

Can anyone help me with this math please

Mathematics
1 answer:
aliya0001 [1]3 years ago
3 0
What grade are you in
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21 +3+ (3 x 9) * 9+5
topjm [15]

Answer:

272

Step-by-step explanation:

Do you need this?

4 0
3 years ago
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Course Activity: Relationships Betwee
Alenkinab [10]

Answer:

yes

Step-by-step explanation:

A rational number is in the form p/q where p and q are both integers and the denominator q is not equal to zero. This means that the set of all real numbers are rational numbers.

Since q can be any integer apart from zero, it means that all integers are rational numbers i.e for q = 1.

Hence 2 which can be written as fraction as 2/1 is a rational number since the denominator (q = 1) is a non zero number

5 0
3 years ago
A train travels 110 km in the same time that a plane covers 385 km. If the speed of the plane is 20 km per hr less than 4 times
slamgirl [31]

Answer:

  • train: 40 kph
  • plane: 140 kph

Step-by-step explanation:

Let t represent the speed of the train in km/h. Then 4t-20 is the speed of the plane. Travel times are the same, so we can use the formula ...

  time = distance/speed

and equate the travel times.

  110/t = 385/(4t-20)

Cross multiplying gives ...

  110(4t -20) = 385t

  440t -2200 = 385t . . . . . eliminate parentheses

  55t -2200 = 0 . . . . . . . . . subtract 385t

  t -40 = 0 . . . . . . . . . divide by 55

  t = 40 . . . . . . . . . . . add 40; train's speed is 40 kph

  4t -20 = 140 . . . . . . find plane's speed; 140 kph

The train's speed is 40 km/h; the plane's speed is 140 km/h.

_____

<em>Check</em>

Train's travel time = 110 km/(40 km/h) = 2.75 h.

Plane's travel time = 385 km/(140 km/h) = 2.75 h.

4 0
3 years ago
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Which equation has a slope of –5/2 and a y-intercept of –2?
NISA [10]

Answer:

A. -5x - 2y = -4

Here's my work for it:

7 0
2 years ago
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HELP PLEASE Assignment due soon
krek1111 [17]

Answer:

4.45

Step-by-step explanation:

theorem \: pythagoras \\  \sqrt{5.1 {}^{2} }  +   \sqrt{} {5.7}^{2}  \\ bc = 7.65 \\ bd = 7.65 - 3.2  \\ bd = 4.45

7 0
3 years ago
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