1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
In-s [12.5K]
3 years ago
12

Rafa went to Lone Star Auto who charges $35 for each car plus $7 per hour. If Rafa's bill was $63, how many hours did he get his

car worked on?
Mathematics
1 answer:
miss Akunina [59]3 years ago
4 0

Answer: 4 hours

Step-by-step explanation:

Given

Auto charge a fixed amount of $35

and $7 per hour

Rafa bill was $63

Suppose Rafa travels for x hours. So, we can write

\Rightarrow 63=35+7x\\\Rightarrow 28=7x\\\Rightarrow x=4\ \text{hour}

You might be interested in
Need help any body help please
lutik1710 [3]
For the first one (aka 7)  you would write 10² wich is the same as 10×10 and so the answer is 100

For the second one (aka 8) you would write 3×3×3×3×3×3×3×3×3 and the answer is 486 square miles

6 0
3 years ago
I’m triangle PQR, SP = SQ. What is SQR? Help please.
My name is Ann [436]

Answer:

25

Step-by-step explanation:

we have to subtract SPQ from SRQ=SQR

mark me as brainliest

8 0
3 years ago
which graph represents the solution set of the system of inequalities? (is my selected answer correct, if not please help!!)
algol [13]

Answer:

the graph on the right-top

Step-by-step explanation:

Transferring an "x" to the right side in x+y\ge-3, we get y\ge -x-3

The system of inequalities is

\left \{ {{y

We have y=2x+2 - ascending function with a=2, b=2

b=2 shows that ascending function intersects Y-axis is in y=2 - that situation is only on the right-top and left-down. So, we refuse left-top and right-down.

y=-x-3 - descending function with a=-1, b=-3

y<2x+2 is an area below the ascending function and we see that on the left-

y\ge-x-3 is an area above the descending function

On the left-down we have an area above both functions, so we refuse this picture

Right-top is correct


7 0
3 years ago
Which number sentence is true?
statuscvo [17]
The answer would be D
3 0
2 years ago
Grades on a standardized test are known to have a mean of 1000 for students in the United States. The test is administered to 45
krok68 [10]

Answer:

a

The 95% confidence interval is 1003  <  \mu

b

Yes there is statistically significant evidence that students in Florida perform differently from other students in the United States

Step-by-step explanation:

From the question we are told that

   The population mean is  \mu =  1000

   The sample size is  n =  453

   The sample mean is  \= x  = 1013

    The standard deviation is s =  108

   

Given that the confidence level is  95% then the level of significance is mathematically represented as

            \alpha  =  100 - 95

=>         \alpha  =  5\%

=>          \alpha  = 0.05

The critical value  for \frac{\alpha }{2} obtained from the normal distribution table is          

          Z_{\frac{\alpha }{2} } =  1.96

Generally the margin of error is mathematically represented as

         E =  Z_{\frac{\alpha }{2} } *  \frac{s}{\sqrt{n} }

=>     E =  1.96 *  \frac{108}{\sqrt{453} }

=>      E = 9.946

Generally the 95% confidence interval is mathematically represented as

           \= x  - E  <  \mu <  \= x + E

=>         1013  - 9.946  <  \mu < 1013  + 9.946

=>         1003  <  \mu

Given that the population mean(1000) is not within the 95% confidence interval for l for the average test score for students in Florida, then it means that there is statistically significant evidence that students in Florida perform differently from other students in the United States

 

4 0
3 years ago
Other questions:
  • How many triangles can be constructed with sides measuring 5 m, 16 m, and 5 m?
    9·2 answers
  • Two cards are selected from a standard deck of 52 playing cards. the first is replaced before the second card is selected. find
    11·1 answer
  • F) If two angles are equal, they must be corresponding.​
    9·1 answer
  • (90 points) I need some help on how to write this graph as an equation. Here's the instructions I was given.
    7·1 answer
  • A heron is perched in a tree 50 feet above sea level. Directly below the heron, a pelican is flying 17 feet above sea level. Dir
    14·1 answer
  • Someone pls help me before my dad goes nuts
    15·1 answer
  • Which sentence states the author’s point of view of microloans?
    9·1 answer
  • Select the correct answer from each drop-down menu.
    11·1 answer
  • AB= 6 cm, AC = 12 cm Calculate the length of CD. Give your answer to 3 significant figures. ​
    6·1 answer
  • Please help? <br> I don’t understand this
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!