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hichkok12 [17]
2 years ago
11

Ok so you guys i want to make an editing account but what should be the username

Mathematics
2 answers:
Travka [436]2 years ago
8 0

Answer:

crzy.editz

Step-by-step explanation:

Annette [7]2 years ago
7 0

fye.editz0nly

Step-by-step explanation:

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A track star runs two races on a certain day. The probability thathe wins the first race is 0.7, the probability that he wins th
NARA [144]

Answer:

a) 80% probability that he wins at least one race.

b) 30% probability that he wins exactly one race.

c) 20% probability that he wins neither race.

Step-by-step explanation:

We solve this problem building the Venn's diagram of these probabilities.

I am going to say that:

A is the probability that he wins the first race.

B is the probability that he wins the second race.

C is the probability that he does not win any of these races.

We have that:

A = a + (A \cap B)

In which a is the probability that he wins the first race but not the second and A \cap B is the probability that he wins both these races.

By the same logic, we have that:

B = b + (A \cap B)

The probability that he wins both races is 0.5.

This means that A \cap B = 0.5

The probability that he wins the second race is 0.6

This means that B = 0.6

B = b + (A \cap B)

0.6 = b + 0.5

b = 0.1

The probability that he wins the first race is 0.7.

This means that A = 0.6

A = a + (A \cap B)

0.7 = a + 0.5

a = 0.2

A) he wins at least one race.

This is

P = a + b + (A \cap B) = 0.2 + 0.1 + 0.5 = 0.8

There is an 80% probability that he wins at least one race.

B) he wins exactly one race.

This is

P = a + b = 0.2 + 0.1 = 0.3

There is a 30% probability that he wins exactly one race.

C) he wins neither race

Either he wins at least one race, or he wins neither. The sum of these probabilities is 100%.

From a), we have that there is an 80% probability that he wins at least one race.

So there is a 100-80 = 20% probability that he wins neither race.

6 0
3 years ago
What is the surface area of a storage box that measures 15 centimeters by 12 centimeters by 8 centimeters?
Leya [2.2K]
L = 15
w = 12
h = 8

Surface Area = 2(lw + wh + lh)
S.A. = 2(15*12 + 12*8 + 15*8)
S.A. = 2(180 + 96 + 120)
S.A. = 2(396)
S.A. = 792 cm^2
7 0
3 years ago
Use the spinner to identify the probability of the pointer landing on a shaded area to the nearest hundredth. HELP?!!
Pie

A full circle = 360 degrees.

The sum of the shaded portions is : 60 + 55 + 45 = 160.

The probability would be the shaded portion divided by the full circle:

160 / 360 = 0.44

4 0
2 years ago
Find the correct result<br><br> 1+4 = 5<br> 2+5 = 12<br> 3+6 = 21<br> 5+8 =
kkurt [141]

Answer: 45

Step-by-step explanation:

As we can see here, the relation is as follows:

(1)(4)+1 = 4+1= 5

(2)(5)+2 = 10+2 =12

(3)(6)+3 = 18+3= 21

Then, if we follow the same pattern:

(4)(7)+4 = 28+4= 32

Hence:

(5)(8)+5 = 40+5=45

6 0
3 years ago
What is an equation of the line
Firdavs [7]

Answer:

Step-by-step explanation:

A line that is perpendicular to a reference line will have a slope that is the negative inverse of the reference line.

In this case, the reference line is y = -x - 1.  It has a slope of -1.  The negative inverse of this would be -(1/-1) = 1.

We can then write:

y = mx + b

y = 1x + b

To find b, enter the one given point that lines on the line, (-4,2).

y = 1x + b

y = 1x + b for (-4,2)

2 = 1(-4) + b

b = 6

The equation becomes y = x + 6

See attached.

3 0
2 years ago
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