All categories

3 years ago

Simplify these expressions. a. 2r + 3 + 4r b. 8 + 3d + d c. mn + (–3mn) + 6 d. 10s + (–10) + (–4s)

Mathematics

2 answers:

liraira [26]3 years ago

8 0

Answer:

a) 3 + 6r

b) 8 + 4d

c) 6 - 2mn

d) -10 + 6s

Step-by-step explanation:

Combine all like-terms:

d) 10s + -10 + -4s

-10 + 6s

c) mn + -3mn + 6

6 - 2mn

b) 8 + 3d + d

8 + 4d

a) 2r + 3 + 4r

3 + 6r

I am joyous to assist you anytime.

Art [367]3 years ago

4 0

Answer:

a) 6r + 3

b) 8 + 4d

c) -2mn

d) 6s - 10

Step-by-step explanation:

a) 2r + 3 + 4r

We need to add the like terms

= 2r + 4r + 3

= 6r + 3

b) 8 + 3d + d

We need to add the like terms

= 8 + 3d + d

= 8+4d

c) mn + (–3mn)

We need to add the like terms

= mn - 3mn

= -2mn

d) 10s + (–10) + (–4s)

We need to add the like terms

= 10s –10 –4s

= 10s - 4s - 10

= 6s - 10

You might be interested in

The function f(x)=3g(x). Which of the following shows possible graphs of f(x) and g(x)?

alukav5142 [94]

Answer:

The answer was graph 2

Step-by-step explanation:

I am horrible at explaining but this is the answer

8 0

4 years ago

Dean Halverson recently read that full-time college students study 20 hours each week. She decides to do a study at her universi

romanna [79]

Answer: The p-value is 0.154.

Step-by-step explanation:

Since we have given that

We claim that

Null hypothesis :

$H_0:\mu=20$

Alternate hypothesis :

$H_1:\mu$

Population mean = 20 hours

Sample mean = 18.5 hours

Sample standard deviation = 4.3 hours

Sample size n = 35

So, test statistic would be

$z=\dfrac{\bar{X}-\mu}{\dfrac{\sigma}{\sqrt{n}}}\\\\z=\dfrac{18.5-20}{\dfrac{4.3}{\sqrt{35}}}\\\\z=\dfrac{-1.5}{0.726}\\\\z=-2.066$

So, the p value would be 0.154.

Hence, the p-value is 0.154.

4 0

3 years ago

A roller coaster begins at 45 feet above ground level. Then it descend 52 feet. Find the height of the coaster after the first d

ioda

Answer:

-7 feet above the ground

Step-by-step explanation:

8 0

3 years ago

josh bought followers for nancy. he spent a total of $14.85 and bought 13 flowers. if he knows lilies cost $1.25 and tulips cost

Serjik [45]

Answer:

x = lillies

y = tulips

x + y = 13

1.25x + .90y = 14.85

-1.25x - 1.25y = -16.25

1.25x + .90y = 14.85

-0.35y = -1.40

y = 4 tulips

x + 4 = 13

x = 9 lillies

(9 lillies, 4 tulips)

Step-by-step explanation:

8 0

4 years ago

Read 2 more answers

Population lottery numbers: 56, 42, 19, 8, 24, 13 find the total number of samples of size 4 that can be drawn from this populat

statuscvo [17]

Answer:

The correct answer is there are 15 samples each of size 4 to choose from the population and the population mean is 27.

Step-by-step explanation:

Total number of lottery tickets = 6

Number of samples of size 4 that can be drawn from this population of 6 lottery numbers are = $\left[\begin{array}{ccc}6\\4\end{array}\right]$ = 15.

Now the population mean is given by $\frac{1}{n}$ × ∑ x , where n is the number of lottery tickets and ∑ x is the sum of the lottery numbers.

Summation of the lottery ticket numbers is 162

Thus the population mean is given by $\frac{162}{6}$ = 27.

8 0

4 years ago