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madam [21]
3 years ago
15

Three teams a,b,c play in a competition

Mathematics
1 answer:
Hitman42 [59]3 years ago
4 0

Answer:

25:2

Step-by-step explanation:

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What is Y if X-2Y = Z?
kakasveta [241]

Answer:(2) y = 2

Step-by-step explanation:

If x + 2y = z, what is the value of x?  3y = 4.5 + 1.5z y = 2

8 0
2 years ago
the book fair had a sale where 6 book were $20.46 if you wanted to buy 7 books ,how much money would you need ?
Rina8888 [55]

Answer:

$23.87

Step-by-step explanation:

Start by finding out how much one book costs-

$20.46/6=3.41

Then find out how much seven books cost- 3.41 (7)=$23.87

4 0
2 years ago
Read 2 more answers
A cashier earns $7 an hour. If x is the number of hours worked, which function represents the cashier’s earnings?
jenyasd209 [6]
You can pick a symbol, maybe m or z to be the symbol.
7 0
3 years ago
Read 2 more answers
In Exercises 23–36, solve the system using either Gaussian elimina- tion with back-substitution or Gauss-Jordan elimination. 23.
Luba_88 [7]

Answer:

23) x= 3, y = 4

24) Any (x,y) values where x = 1.5 - 2y

Step-by-step explanation:

For the first system(23), it goes like this

[1 2 | 7]

[2 1 | 8]

We need to do L2 = L2 - 2L1, so now it is

[1 2   | 7]

[0 -3 |-6]

So, now we have:

-3y = -6 *(-1)

3y = 6

y = 2

x + 2y = 7

x + 4 = 7

x = 3

Now for system 24, we have:

[-1 2 | 1.5]

[2 -4| 3]

We do L2 = L2 + 2L1, so we have:

[-1 2 | 1.5]

[0 0| 0]

So there are infinite solutions for this system. The solution for this system will be each (x,y) pair where x = 1.5 - 2y.

5 0
3 years ago
It has been estimated that only about 30% of California residents have adequate earthquake supplies. Suppose we are interested i
lidiya [134]

Answer:

Step-by-step explanation:

We are given that 30% of California residents have adequate earthquake supplies.

a) Ramon variable X denotes the number of the california residents that have adequate earthquake insurance

B) x can take value 1 ,2 ,3 ......

C)The distribution of random variable is geometric distribution with parameter p=0.3

The pmf of geometric distribution is

P(X=x)=0.3(1-0.3)^{x-1} , x=1,2,3...

D)P(X=1) or P(X=2)=P(X=1)+P(X=2)

P(X=1) or P(X=2)=0.3(1-0.3)^{1-1}+0.3(1-0.3)^{2-1}=0.51

E)

P(X \geq 3)=1-P(X

F)

E(X)=\frac{1}{p}

p is the resident who does not have adequate earthquake supplies.

p = 1-0.3 = 0.7

E(X)=\frac{1}{0.7}=1.42

G)E(X)=\frac{1}{q}=\frac{1}{0.3}=3.33

8 0
3 years ago
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