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3 years ago

An elevator goes up 7 floors and then down 4 floors .what integet represent the change in the floor level

Mathematics

1 answer:

nexus9112 [7]3 years ago

4 0

Answer:

it's 3

Step-by-step explanation:

it went up 7 floors and went down 4 floors, if you subtracted those it will be 3.

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3 years ago

Find the distance between the points (2,4) and (5,0). (PLEASE HELP!)

weeeeeb [17]

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4 years ago

Louise has only 5 cent, 10 cent, and 20 cent coins in her purse. She has 30 coins in total, and she has two more 10 cent coins t

Hoochie [10]

Let x = number of 5 cent coins.
Then there are (x+2) 10 cent coins.
Let y = 20 cent coins.
Total coins: x+(x+2)+y = 30
2x+y=28
y = 28-2x (1)
Total value: 0.05x + 0.1(x+2) + 0.2y = 3.80
0.15x + 0.2y + 0.2 = 3.80
0.15x + 0.2y = 3.60 (2)
Substitute (1) into (2).
0.15x + 0.2(28-2x) = 3.60
-0.25x + 5.60 = 3.60
2.00 = 0.25x
8 = x

From (1), obtain y = 28 - 2(8) = 12
Answer: (x+2) = 8+2 = 10
Louise has 10 10-cent coins

3 0

3 years ago

For a fixed amount of a gas at a constant temperature, the volume of the gas is inversely proportional to its pressure. At a pre

Veronika [31]

we know that

A relationship between two variables, x, and y, represent an inverse variation if it can be expressed in the form $y*x=k$ or $y=k/x$

Let

x-------> the pressure in PSI

y------> the volume of the gas in cubic inches

In this problem we have the point $(30,600)$

$x=30\ psi\\y=600\ in^{3}$

Find the constant k

$y*x=k$

substitute the values of x and y

$600*30=k$

$k=18,000\ lb*in$

the equation is

$y=18,000/x$

therefore

<u>the answer is</u>

$y=18,000/x$

4 0

3 years ago

Read 2 more answers

How can i better understand how to do this?

guajiro [1.7K]

Answer:

1.5 cm/s

Step-by-step explanation:

The graph shows the speed of a worm as a relationship between the distance it can travel in centimeters over time, or seconds. Since the graph forms a straight line, then we know that the speed of the worm is constant over time, meaning that he will move the same distance each second. Given the point (6,9) on the graph, this tells us that the worm moved 9 centimeters in 6 seconds or:

$\frac{distance}{time}=\frac{centimeters}{seconds}=\frac{9}{6}$

So, the ratio of centimeters over seconds is 9/6. However, unit rate is the distance every second or putting the ratio over '1'. We can do this by diving the numerator by the denominator or 9 ÷ 6 = 1.5 centimers/second.

4 0

3 years ago