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3 years ago

Hey guys I need help my brain isn’t working today

Mathematics

2 answers:

Inessa05 [86]3 years ago

7 0

Answer:

It's okay my brain doesn't work some days, too.

1. x = -7

2. x = -6

3. x = -1

4. y = 4

Step-by-step explanation:

1. Simply subtract equal and opposite values from positive values and do the same on both sides. Divide the final x value by its coefficient to get 1x = -7

2. Do the same as above AFTER distributing the 4(5 - x)

3. Once again, distribute all values then combine like terms like #1

4. This one uses a fraction to distribute, but it is just like dividing the number by 3 instead of multiplying (6/3 instead of 6 * 3)

Hope I helped!

Brilliant_brown [7]3 years ago

4 0

1. x=7
2. x= -6
.
.
.
.
the other 2 i got lazy but need points sorry

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PLEASE HELP I'M TIMED

DedPeter [7]

Really hope i'm right

1st row

the first one is length less than 10

one next to it is width greater than 5

next to that is length greater than 10

2nd row

the first one is length greater than 10

one next to that is width less than 5

next to that is width greater than 5

3rd row

first one is width less than 5

and last is length less than 10

4 0

3 years ago

At a highschool, 90% of the students take physics and 35% of the students take both physics and statistics. What is the probabil

7nadin3 [17]

Answer:

38.89% probability that a student that is taking Physics is also taking Statistics

Step-by-step explanation:

Conditional probability formula:

Two events, A and B.

$P(B|A) = \frac{P(A \cap B)}{P(A)}$

In which

P(B|A) is the probability of B happening, given that A has happened.

$P(A \cap B)$ is the probability of these two events happening.

P(A) is the probability of A happening.

In this problem, we have that:

A: physics

B: statistics.

90% of the students take Physics

This means that $P(A) = 0.9$

35% of the students take both Physics and Statistics.

This means that $P(A \cap B) = 0.35$

$P(B|A) = \frac{P(A \cap B)}{P(A)} = \frac{0.35}{0.90} = 0.3889$

38.89% probability that a student that is taking Physics is also taking Statistics

8 0

4 years ago

Need Help Due Tomorrow <br><br> MUST SHOW WORK!!!<br> DONT BOTHER ANSWERING IF YOU CANT SHOW WORK

Dafna1 [17]

Answer:

Step-by-step explanation:

we know that (x-5) and (y-6) must add up to 129 because 180-51 is 129

now let's plug in the values to see

51-5= 66 63-6 = 57

57+66 is 123, not this one, let's repeat the same step

77-5 is 72, 63-6 is 57, these added is 129

5 0

3 years ago

There are 100 people in a sport centre. 67 people use the gym. 62 people use the swimming pool. 56 people use the track. 38 peop

Gennadij [26K]

Answer:

7/10

Step-by-step explanation:

For a person to use at least two of the facilities means they can use the three facilities as well.

Let n(U) be the total people in the sport centre = 100

n(G) be people that uses gym = 67

n(S) be people that uses swimming pool = 62

n(T) be people that uses track = 56

n(GnP) be gym and pool = 38

n(PnT) be people that use the pool and the track = 31

n(GnT) be people that use the gym and the track = 33

n(GnPnT) be people that use all three facilities = 16

People that uses gym and pool only = n(GnP) - n(GnPnT)

= 38-16

= 22

People that uses pool and track only = n(PnT) - n(GnPnT)

= 31-16

= 15

People that uses gym and track only = n(GnT) - n(GnPnT)

= 33-16

= 17

Total people that uses at least 2 facilities = 16+22+15+17 = 70

Probability that this person uses at least 2 facilities = Total people that uses at least 2 facilities/Total people in the sport centre

Probability that this person uses at least 2 facilities = 70/100 = 7/10

4 0

4 years ago

Yolanda paid for her movie ticket using 28 coins all nickles and quarters. The ticket cost $4. Which system of linear equations

notsponge [240]

Answer:

The number of nickels are 15 and the numbers of quarters are 13 .

Step-by-step explanation:

As given

The number of nickles = n

The number of quarter be q

As given

Yolanda paid for her movie ticket using 28 coins all nickles and quarters.

Than the equations becomes

n + q = 28

As given the ticket cost $4.

1 quarter = 0.25 dollar

1 nickel = 0.05 dollar

Than the equation becomes

0.05n + 0.25q = 4

Simplify the above

$\frac{5n}{100} + \frac{25q}{100} = 4$

5n + 25q = 400

Than two equations are

n + q = 28 and 5n + 25q = 400

Multiply n + q = 28 by 5 and subtracted from 5n + 25q = 400 .

5n - 5n + 25q - 5q = 400 - 140

20q = 260

$q = \frac{260}{20}$

q = 13

Put in the equation n + q = 28

n + 13 = 28

n = 28 - 13

n = 15

Therefore the number of nickels are 15 and the numbers of quarters are 13 .

8 0

3 years ago