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pentagon [3]
3 years ago
6

Combine the like terms to create an equivalent expression:2r+1+(−4r)+7

Mathematics
1 answer:
STatiana [176]3 years ago
3 0

Answer:

2r+1+(-4r)+7

= -2r+8

= -2(r+4)

Step-by-step explanation:

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Simplify the product using a table.
bearhunter [10]
The answer is b

i think , im not sure
6 0
3 years ago
I dont get how you solve these i need some help
nalin [4]

Answer:

3rd one y=2x

Step-by-step explanation:

because they are saying how many minutes can you read 2 pages so it would be 2 times x and x is the 4 minutes

4 0
3 years ago
Two people are driving to work at different constant speeds. The graph below shows the distance traveled over time by driver 1.
Luden [163]

Answer:

5 mph

Step-by-sep explanation:

To find of out the difference between the speed of the two drivers in miles per hour (not in miles per minute), first, calculate the unit rate or speed of driver 1 using the graph, and driver 2 using the table given.

Unit rate/speed = distance travelled/time = y/x.

Speed of Driver 1/unit rate:

The graph shows 1.5 miles (y) is travelled in 2 minutes (x).

Convert the 2 minutes to hour, you will have:

\frac{2}{60} = \frac{1}{30} hr

Speed in mph = \frac{y}{x} = \frac{1.5}{\frac{1}{30}} = 1.5*\frac{30}{1} = 45

Speed of Driver 1 in mph = 45 mph

Speed of Driver 2/unit rate:

The table shows 2.5 miles (y) is travelled in 3 minutes (x).

Convert the 3 minutes to hour, you will have:

\frac{3}{60} = \frac{1}{20} hr

Speed in mph = \frac{y}{x} = \frac{2.5}{\frac{1}{20}} = 2.5*\frac{20}{1} = 50

Speed of Driver 2 in mph = 50 mph

Difference between the speed of the two drivers = 50 - 45 = 5 mph

4 0
3 years ago
Find the critical value from the Studentized range distribution for H0: μ1 = μ2 = μ3 = μ4 = μ5, with n = 35 at α = 0.01. Provide
Aleonysh [2.5K]

Answer:

t-value = 2.441

Step-by-step explanation:

Let's assume that this is a one-tailed test to calculate the critical value, the process is this:

  • Calculate alpha (α): α = 1 - (confidence level / 100) , but we already have this α=0.01
  • Find the critical probability (p*): p* = 1 - α/2  = 1-0.005=0.995
  • Then, the critical value would be shown as a t statistic, but for this we need:

degrees of freedom (df)= n-1=35-1=34

  • The critical t statistic (t*) or critical value is the t-value having degrees of freedom equal to 34 and a cumulative probability equal to 0.995.

From the attached table we can see:

t-value = 2.441

8 0
3 years ago
(X,3) , (5,9) slope=2
maxonik [38]
Equation for slope.
y2 - y1/x2 - x1
Using (x,3) and (5,9)
9 - 3/5 - x = 2
6/(5 - x) = 2
Cross multiply
6 = 2(5 - x)
6 = 10 - 2x
6 - 10 = -2x
-4 = -2x
x = 2
y2 - y1/x2 - x1
9 - 3/5 - 2
6/3 = 2
Hope this helps.
:-)

5 0
3 years ago
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