All categories

3 years ago

Help help math math math

Mathematics

2 answers:

Anarel [89]3 years ago

6 0

Answer:

i think this is right i hope it helped :)

Step-by-step explanation:

5m - 8 = 2m + 1

5m + 2m - 8 = 1

7m - 8 = 1

7m = 7

m = 1

OverLord2011 [107]3 years ago

6 0

Answer:

<em><u>m = 3</u></em>

Step-by-step explanation:

5m - 8 = 2m + 1

5m - 2m = 1 + 8 { like terms }

3m = 9 { crossing over }

m = 3

You might be interested in

What is the e at the end of a scientific number?

kherson [118]

Scientific notation is another way to write a number. In scientific notation, the letter E is used to mean "10 to the power of." For example, 1.314E+1 means 1.314 * 101 which is 13.14 .

6 0

3 years ago

The following table shows the probability of rolling the numbers 1 through 7

Marysya12 [62]

Answer:

2.0

Step-by-step explanation:

Couldn't really understnd what you wrote but I'll assume it's the standard deviation of a fair, 7-sided die

The standard deviation is just the square root of the variance (which is just the second moment minus the first moment squared)

The first moment (AKA the average is..)

$\frac{1+2+3+4+5+6+7}{7}=4$

The second moment is..

$\frac{1^2+2^2+3^2+4^2+5^2+6^2+7^2}{7}=20$

$\sqrt{20-4^2}=2$

4 0

3 years ago

Help with the picture

True [87]

Answer:

The first question is 9.

The second is 36.

The third is 8 1/2

Step-by-step explanation:

For the first one, there are 8 cubes plus the two halves, which equal 1 so 8 plus 1 equals 9.

The second one is 9 divided by a quarter which is 1/4, 9 divided by 1/4 equals 36.

For the third, length times witdth times height equals volume. So then (you don’t have to do it in order but) 2 times 1 times 4 1/4 equals 8 1/2.

4 0

3 years ago

Ten children visited Grandma after school for cookies and milk. Grandma divides 1/2 gallon off milk into 10 equal glasses for th

Kisachek [45]

Answer:

Answer should be 1/20

Step-by-step explanation:

8 0

3 years ago

If the student has already read 2525 of the pages, how long will it take them to read the rest of the book? _____ minutes Your a

Alja [10]

The number of pages the student can read in a minute is an illustration of rates.

The time left to complete the whole book is 90 minutes

From the complete question, the student's rate is:

$\mathbf{Rate = 50\ pages/hr}$

The number of pages is:

$\mathbf{Total = 100\ pages}$

First, we calculate the time to read the whole book

$\mathbf{Total\ Time = \frac{Total\ pages}{Rate}}$

$\mathbf{Total\ Time = \frac{100\ pages}{50\ pages/ hr}}$

$\mathbf{Total\ Time = 2\ hours}$

The number of the student has read is:

$\mathbf{Pages = 25}$

Next, we calculate the time spent on the 25 pages

$\mathbf{Time\ Spent = \frac{Pages}{Rate}}$

$\mathbf{Time\ Spent = \frac{25\ pages}{50\ pages/hr}}$

$\mathbf{Time\ Spent = 0.5\ hr}$

Convert to minutes

$\mathbf{Time\ Spent = 30\ minutes}$

So, the time left is:

$\mathbf{Time\ Left = Total\ Time - Time\ Spent}$

This gives

$\mathbf{Time\ Left = 2\ hours- 30\ minutes}$

$\mathbf{Time\ Left = 1\ hour, 30\ minutes}$

Convert to minutes

$\mathbf{Time\ Left = 90\ minutes}$

Hence, the time left is 90 minutes