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ehidna [41]
3 years ago
11

Is -20 an irrational number or rational number

Mathematics
2 answers:
maw [93]3 years ago
5 0
It’s a rational number because I saw the other comment so I will just go with that
Gekata [30.6K]3 years ago
3 0

Answer: Rational number

Step-by-step explanation:

Let's write out the properties of rational and irrational numbers.

Rational

  • Integers
  • Whole numbers
  • finite decimals
  • repeating decimals

Irrational

  • not rational numbers

------------------------------------------------------------------------------------------------------------

Looking at the list we made, we can say that -20 is a rational number. -20 is an integer and a whole number. Therefore, it is a rational number.

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Which is the largest interval over which the function in the table is increasing?
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Answer:

Solution given:

y=-1/2 x²

for

f(x)=-1/2 x².

differentiating each term with respect to x

f'(x)=-x

when

x=-4

f'(-4)=4>0 increasing

when

x=-2

f'(-2)=2 >0 increasing

when x=0

f'(0)=0 stationary point.

other points are decreasing

so

largest interval of increasing is

A.X<-2

6 0
3 years ago
Read 2 more answers
Suppose 300 nursing students took a certification test that is worth 100 points.
Alja [10]

Answer:

225 students scored 65 or better and 75 students scored 88 or better.

Step-by-step explanation:

We are given that The five-number summary for the scores of 300 nursing students are given :

Minimum = 40

Q_1 = 65

Median = 82

Q_3 = 88

Maximum = 100

Q_1 is the first quartile and is the median of the lower half of the data set. 25% of the numbers in the data set lie below Q_1 and about 75% lie above Q_1 .

Q_3 is the third quartile and is the median of the upper half of the data set. 75% of the numbers in the data set lie belowQ_3 and about 25% lie above Q_3

i) .About how many students scored 65 or better?

Q_1 = 65

Since we know that 75% lie above Q_1 .

So, Number of students  scored 65 or better = 75\% \times 300 = \frac{75}{100} \times 300 =225

ii)About how many students scored 88 or better?

Q_3 = 88

Since we know that 25% lie above Q_3

So, Number of students scored 88 or better = 25\% \times 300 = \frac{25}{100} \times 300 =75

Hence 225 students scored 65 or better and 75 students scored 88 or better.

7 0
4 years ago
What three consecutive even numbers added up together equal 42
sdas [7]
12+14+16=42 is your answe
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4 years ago
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What is the slope of each line? line a: y=1/2x-4 line b: y=2x-3
MariettaO [177]
Y=mx + b
m is the slope

The slope of line 1 is 1/2

The slope of line 2 is 2
8 0
3 years ago
Write the equation y=(x-4)(x+2) in standard form
timofeeve [1]

Answer:

y = x² - 2x - 8

Step-by-step explanation:

Given

y = (x - 4)(x + 2)

Each term in the second factor is multiplied by each term in the first factor, that is

x(x + 2) - 4(x + 2) ← distribute parenthesis

= x² + 2x - 4x - 8 ← collect like terms

= x² - 2x - 8 ← in standard form

6 0
3 years ago
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