you have 10 cards numbered from 1 to 10. you choose a card at random. then without replacing the first card, you choose anothercrd at random. what is the probability that ypu choose to even numbers?

Answers

Answer 1

Answer: 1/2 for the first draw and 4/9 for the second draw

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Four students spent $12 on school lunch. At this rate find the amount 10 students would spend on the same school lunch.
What is the answer to double 7 multiply 3 and 1 and then subtract the second from the first number
Which is greater 0.55 or 2/5 or 0.46
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The product of 4 and the difference of 7 and 5

2x +3y =12 Dan 3x-1y=7

Answers

2x+3y=12
3x-y=7

use subsituttion
make one of the equations equal to a placeholder
3x-y=7
subtract 7
3x-7-y=0
add y
3x-7=y
subsisute 3x-7 for y in first equation

2x+3(3x-7)=12
2x+9x-21=12
11x-21=12
add 21 to both sides
11x=33
divide both sides by 11
x=3

subsitute x for 3 in any equation
3x-7=y
3(3)-7=y
9-7=
2=y

x=3
y=2

2x+3y=12
3y=-2x+12
y=-2x/3+4

3x-1y=7
-1y=-3x+7
y=3x-7

Must the difference between 2 rational numbers be a rational number?

Answers

Yes. The difference between 2 rational numbers must be a rational number.

The first rational number can always be written as a fraction of integers.
Let's call it   A/B .

The second rational number can always be written as a fraction of integers.
Let's call that one C/D .

   Their difference is A/B - C/D .

   'BD' is a common denominator.

   A/B = AD/BD

   C/D = CB/BD

   A/B - C/D = AD/BD - CB/BD =

      (AD - CB) / BD

Each term in that ugly thing /\ is a product of integers,
so it must be must be another integer.

Therefore the whole ugly fraction is another rational number.

a/b - c/d with a,b,c,d as integers and b,d ≠ 0. a/b - c/d -> ad/bd - bc/bd --> (ad - bc)/bd
The difference will always be rational. This is because the denominator will never be 0. Everything is closed under some kind of operation, and the answers will always be able to be written as a ratio.
Hope that helped.

What is .1325 to the nearest thousand

Answers

0.1325 rounded to the nearest thousand not thousandth is the same 0.1325 because the thousands place is 0 because it is not present in this number.

Answer: 0.1325

*Hope that helps and enjoy Brainly :)

Why are 1,4,9,16,and 25 sometimes are called perfect square please HELP ME!!!!!!

Answers

They are all perfect squares because if you took the square root of them you will get a single number. Like the square root of 25 is 5 bc 5(5) is 25
16 is 4 bc 4(4) is 16
9 is 3 bc 3(3) is 9
1 is 1 bc 1(1) is 1
& so on & so forth

Listed below are sorted duration times (seconds) of eruption of the old Faithful geyser in Yellowstone National Park. use these to construct a frequency distribution

Answers

Answer:

See explanation

Step-by-step explanation:

Width = 25 seconds

Lower class limit = 125 seconds

To find the frequency of each class, just count the numbers which appear in described class

Hence, the frquency distibution is

Classes: Frequency

125 - 150 seconds 1

151 - 175 seconds 0

176 - 200 seconds 0

201 - 225 seconds 4

226 - 250 seconds 34

251 - 275 seconds 11

Identify the equivalent of:6 = 7x – y
A. 6 + 7x = y
B. -6 + 7x = y
C. -6 - 7x = y
D. 6 - 7x = y

Answers

I believe the answer is B. -6 + 7x = y

Answer:

Step-by-step explanation:

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