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Gre4nikov [31]
3 years ago
15

Witch quadrilateral has 4 right angles

Mathematics
2 answers:
Oliga [24]3 years ago
6 0
Based on what's written down, I think you have it. The two shapes you identified there are a rectangle (5) and square (1).
FromTheMoon [43]3 years ago
3 0
The Quadrilateral that has 4 right angles is number 5
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How would you do a,b,c,and d
I am Lyosha [343]

a) You are told the function is quadratic, so you can write cost (c) in terms of speed (s) as

... c = k·s² + m·s + n

Filling in the given values gives three equations in k, m, and n.

28 = k\cdot 10^2+m\cdot 10+n\\21=k\cdot 20^2+m\cdot 20+n\\16=k\cdot 30^2+m\cdot 30+n

Subtracting each equation from the one after gives

-7=300k+10m\\-5=500k+10m

Subtracting the first of these equations from the second gives

2=200k\\\\k=\dfrac{2}{200}=0.01

Using the next previous equation, we can find m.

-5=500\cdot 0.01+10m\\\\m=\dfrac{-10}{10}=-1

Then from the first equation

[tex]28=100\cdot 0.01+10\cdot (-1)+n\\\\n=37[tex]

There are a variety of other ways the equation can be found or the system of equations solved. Any way you do it, you should end with

... c = 0.01s² - s + 37

b) At 150 kph, the cost is predicted to be

... c = 0.01·150² -150 +37 = 112 . . . cents/km

c) The graph shows you need to maintain speed between 40 and 60 kph to keep cost at or below 13 cents/km.

d) The graph has a minimum at 12 cents per km. This model predicts it is not possible to spend only 10 cents per km.

4 0
3 years ago
Estimate the following sum by clustering.
Kryger [21]
The answer would be 60. By rounding, 14.2=14; 15.51=16; 14.99=15; 15.8=16.
14+15+16+16=61
Rounding: 61=60
4 0
2 years ago
Read 2 more answers
A safe has a 4-digit lock code that does not include zero as a digit and no digit is repeated. What is The total number of outco
DENIUS [597]

Answer:4*3*2*1

Step-by-step explanation:

6 0
2 years ago
Read 2 more answers
Which expression has the same value as 3,648 - 1,223? A. 3,000 - 1,000 + 40 - 20 + 8 - 3 + 6 - 2 B. 3,000 - 1,000 + 600 - 200 +
natulia [17]

Answer:

B

Step-by-step explanation:

3000-1000 = 2000

600-200 = + 400

40 - 20 = + 20

8 - 3 = + 5

7 0
3 years ago
An electrician charges $40 to come to your house she also charges $55 for each hour that she works the electrician charges you a
s2008m [1.1K]
First lets remove the initial fee
190 - 40 = 150
150 is how much she is charging you per hour.
If each hour is 55, lets divide 150 by 55.
150 \div 55 = 2.7
She charged you for 2.7 hours (almost 3) of service
3 0
3 years ago
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