All categories

3 years ago

Select the proper for parentheses to speed up the addition for the expression 2+9+8+1

Mathematics

2 answers:

NeTakaya3 years ago

6 0

(2+9)+(8+1)=
18. 9.
\. /
27

Anon25 [30]3 years ago

5 0

(2+9)+(8+1)=
18. 9. =
27

You might be interested in

What is the value of k in the linear pair below?

beks73 [17]

B. I do know if it’s a triangle but 180 degrees is what you need to get to so 104+76=180

6 0

3 years ago

Greidella Merthemen Class ac Convert the following e, 2750g to kg

avanturin [10]

Answer:

there is a problem in question is hafe only

8 0

2 years ago

Tina__________ 4 by_____________ to get 16 and 9 by____________ to get 81. She should have multiplied each term by__________ num

andrew11 [14]

Answer:

multiplied 4

9 the same

Step-by-step explanation:

Tina multiplied 4 by 4 to get 16, and 9 by 9 to get 81. she should have multiplied each term by the same number.

7 0

2 years ago

The time needed to complete a final examination in a particular college course is normally distributed with a mean of 80 minutes

mixer [17]

Answer:

0.02275

Step-by-step explanation:

We have been given that the time needed to complete a final examination in a particular college course is normally distributed with a mean of 80 minutes and a standard deviation of 10 minutes. We are asked to find the probability of completing the exam in one hour or less.

We know that 1 hour equals 60 minutes. First of all, we will find the z-score corresponding to 60 minutes.

$z=\frac{x-\mu}{\sigma}$

z = z-score,

x = Sample score,

$\mu$ = Mean,

$\sigma$ = Standard deviation.

$z=\frac{60-80}{10}$

$z=\frac{-20}{10}$

$z=-2$

Now, we will use normal distribution table to find area under z-score of $-2$ as:

$P(z< -2)$

$P(z< -2)=0.02275$

Therefore, the probability of completing the exam in one hour or less is 0.02275.

7 0

3 years ago

(x+y=3 (3x+2y=14 what is the coordinates for this problem

Ludmilka [50]

3x - 2y + 2y > -14 + 2y 

3x + 0 > -14 + 2y 

3x > -14 + 2y 

3x + 14 > -14 + 14 + 2y 

3x + 14 > 0 + 2y 

3x + 14 > 2y 

(3x + 14)/2 > 2y/2 

(3x + 14)/2 > y*(2/2) 

(3x + 14)/2 > y*(1) 

(3x + 14)/2 > y 

y < (3x + 14)/2 

y < 3x/2 + 14/2 

y < 3x/2 + 7 

y < (3/2)*x + 7 

“y” is LESS THAN (3/2)*x + 7 

the slope intercept form of the inequality is: y < (3/2)*x + 7 

STEP 2: Temporarily change the inequality into an equation by replacing the < symbol with an = symbol. 

y < (3/2)*x + 7 

y = (3/2)*x + 7 

STEP 3: Prepare the x-y table using the equation from Step 2. 

Using the slope intercept form of the equation from Step 2, choose a value for x, and then compute y for at least three points. 

Although you could plot the graph with just two sets of x-y coordinates, you should compute at least three different sets of coordinates points to ensure you have not made a mistake. All three x-y coordinates must lie on the same straight line. If they do not, you have made a mistake. 

You can choose any value for x. 

For example, (arbitrarily) choose x = -2 

If x = -2, 

y = (3/2)*x + 7 

y = (3/2)*(-2) + 7 

y = 4

4 0

3 years ago