All categories

3 years ago

Im Confused. Pls Help

Mathematics

1 answer:

frozen [14]3 years ago

6 0

Answer:

a = 15/28

Step-by-step explanation:

As long as the bases are the same, in this case 2, keep the base and add the exponents when multiplying

keep the base and subtract the exponents when dividing

1/4 + 3/7 = 3/28 + 12/28 = 15/28

You might be interested in

The value of x in the expression<br> 2x/3 - 7 = 5 is

Andrej [43]

Answer:

The answer is X = 18

Step-by-step explanation:

2x/3 - 7 = 5

Multiply both sides if the equation by 3 : 2x - 21 = 15

Move the constant to the right hand side and change its sign : 2x = 15 + 21

Calculate 2x = 15 + 21

2x = 36

Divide both sides of the eqaution by 2 : 2x = 36

x = 18

Answer X = 18

3 0

3 years ago

What value of x makes the following equation true 4+3x=160

Alexxandr [17]

Answer:

x=52

Step-by-step explanation:

160=4+3x

Subtract 4 from both sides

156=3x

Divide 3 from both sides

x=52

6 0

3 years ago

Carina says that to divide by 12, she will need to write 12 as the fraction and then divide. Is she correct? Explain your reason

Alika [10]

Answer:

I do not know

Step-by-step explanation:

I think so

6 0

2 years ago

In a local basketball league championship total 198 games were played, where each team played exactly three games with all the o

kifflom [539]

Answer:

Step-by-step explanation:

When n teams play each other once, the total number of games is n(n-1)/2. Since each team played every other one 3 times, the relationship between number of teams (n) and number of games is ...

3(n(n-1)/2) = 198

n(n-1) = 132 = 12·11 . . . . . . multiply by 2/3 and factor

n = 12 . . . . . . n = -11 is also an extraneous solution to this quadratic equation

12 teams participated in this championship.

6 0

3 years ago

How many commuters must be randomly selected to estimate the mean driving time of Chicago commuters? We want 95% confidence that

zimovet [89]

Answer:

61 commuters must be randomly selected to estimate the mean driving time of Chicago commuters.

Step-by-step explanation:

Given : We want 95% confidence that the sample mean is within 3 minutes of the population mean, and the population standard deviation is known to be 12 minutes.

To find : How many commuters must be randomly selected to estimate the mean driving time of Chicago commuters?

Solution :

At 95% confidence the z-value is z=1.96

The sample mean is within 3 minutes of the population mean i.e. margin of error is E=3 minutes

The population standard deviation is s=12 minutes

n is the number of sample

The formula of margin of error is given by,

$E=\frac{s\times z}{\sqrt{n}}$