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Greeley [361]
3 years ago
7

PLEASE HELP ME PLEASE

Mathematics
1 answer:
Sergio [31]3 years ago
4 0

Answer:

A

Step-by-step explanation:

Given

\frac{3}{4} (- 12x + 4) + \frac{1}{2} (6x + 8) ← distribute parenthesis

= - 9x + 3 + 3x + 4 ← collect like terms

= - 6x + 7 → A

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Please can you help me, I only have about 20 minutes to get this done. Thanks!
Salsk061 [2.6K]

Answer:

B: 9d^8

Step-by-step explanation:

Simplify the expression using the rules of exponents.

7 0
3 years ago
1.44 Make-up exam: In a class of 28 students, 27 of them took an exam in class and 1 student took a make-up exam the following d
Olenka [21]

Answer:

a) Decrease

b) New mean = 78.43

c) Decrease                        

Step-by-step explanation:

We are given the following in the question:

Total number of students in class = 28

Average of 27 students = 79

Standard Deviation of 27 students = 6.5

New student's score = 63

a) The new student's score will decrease the average.

b) New mean

Mean = \displaystyle\frac{\text{Sum of all observations}}{\text{Total number of observation}}

Mean = \dfrac{\displaystyle\sum x_i}{27} = 79\\\\\sum x_i = 27\times 79 = 2133

New mean =

\text{ New mean} =\dfrac{ \displaystyle\sum x_i +63}{28}\\\\ =\dfrac{2133+63}{28}= \dfrac{2196}{28} = 78.43

Thus, the new mean is 78.43

c) Since the new mean decreases, standard deviation for new scores will decrease.

This is because the new value is within the usual values i.e. within two standard deviations of the mean. So, this wont cause a lot of variation as this value will be closer to already available data values. Also number of observations (n) in the denominator is increasing. Based on both these points we can conclude that standard deviation will decrease

Formula for Standard Deviation:

\text{Standard Deviation} = \sqrt{\displaystyle\frac{\sum (x_i -\bar{x})^2}{n}}  

where x_i are data points, \bar{x} is the mean and n is the number of observations.

7 0
3 years ago
Please help ;c i dont understand this
son4ous [18]
This is equivalent to z ^(7/8)
hope this helps 
make brainliest if someone else answers .
thanks 
7 0
4 years ago
Read 2 more answers
Point Q was rotated about the origin (0,0) by 180°.
ikadub [295]

Answer:

point b

Step-by-step explanation:

180 wouñd be the opposite with in this case is b

3 0
3 years ago
Read 2 more answers
Please help.... fast​
tia_tia [17]
Ok there is triangles inside triangle
5 0
3 years ago
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