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3 years ago

Adding &subtracting negative numbers Evaluate -2+7+(-4).

Mathematics

2 answers:

bija089 [108]3 years ago

5 0

Answer:

= 1

Step-by-step explanation:

− 2 + 7 −4

=5 −4

= 1

navik [9.2K]3 years ago

4 0

Answer: 1

Step-by-step explanation: calculator lol

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Which expression is equal to the expression below? (7•2)^7

mojhsa [17]

Option A is the right answer

5 0

3 years ago

Read 2 more answers

Please help!!!!!! find the area of the whole rectangle.

Olegator [25]

Answer:

Step-by-step explanation:

The area of a rec tangle is A x W

but first you have to find the area of the triangle wich is going to be 127.5.

Then you have to multiply 127.5 times 15.

And that will give you 1,912.5.

I think this is correct, but im not sure.

8 0

3 years ago

An automobile manufacturer claims that its car has a 42.8 miles/gallon (MPG) rating. An independent testing firm has been contra

yanalaym [24]

Answer: -1.51

Step-by-step explanation:

Let $\mu$ be the population mean rating of car.

As per given , we have

$H_0: \mu=42.8$

$H_a: \mu\neq42.8$

Since population variance is known, so we use z-test.

Test statistic : $z=\dfrac{\overline{x}-\mu}{\sqrt{\dfrac{\sigma^2}{n}}}$

, where n= sample size

$\overline{x}$ = Sample mean

$\sigma^2$ = variance

As per given ,

n=300

$\overline{x}=42.6$

$\sigma^2=5.29$

$\mu=42.8$

Put these values in formula we get

$z=\dfrac{42.6-42.8}{\sqrt{\dfrac{5.29}{300}}}$

$z=\dfrac{-0.2}{\sqrt{0.0176333}}$

$z=\dfrac{-0.2}{0.13279}=-1.50613751035\approx1.51$

Hence, the value of the test statistic is z= -1.51 .

3 0

4 years ago

There are 482 studemts in the school and there are two Grade 4 classes: Ms.Ashley's and Mr.Ben's classes. Mrs. Aheley's class ha

Svetllana [295]

Answer:

1. 45/482 of the students are in grade 4.

2. 5/9 of the students of the grade 4 are boys.

3. 7/15 of the grade 4 students are in Ms. Ashley's class

4. 3/4 of the students in Mr. Ben's class do not have siblings in the same school.

5. There are 14 students with glasses and 7 without glasses.

Step-by-step explanation:

1. Let's review the information given to us for solving the questions:

Number of students in the school = 482

Ms. Ashley's Grade 4 class = 21 students

Ms. Ashley's Grade 4 class boys = 15 students

Ms. Ashley's Grade 4 class girls = 6 students

Ms. Ashley's Grade 4 class with glasses = 2/3 * 21 = 42/3 = 14 students

Mr. Ben's Grade 4 class = 24 students

Mr. Ben's Grade 4 class boys = 10 students

Mr. Ben's Grade 4 class girls = 14 students

Mr. Ben's Grade 4 class with siblings in the school = 1/4 * 24 = 24/4 = 6 students

2. Let's answer all the questions:

1. What fraction of the students in the school are in grade 4?

(Ms. Ashley's Grade 4 class + Mr. Ben's Grade 4 class)/ Number of students in the school

21 + 24 / 482 = 45/482

2. What fraction of the grade 4 students are boys?

(Ms. Ashley's Grade 4 boys + Mr. Ben's Grade 4 boys)/ (Ms. Ashley's Grade 4 class + Mr. Ben's Grade 4 class)

15 + 10 / 21 + 24

25 / 45 = 5/9

3. What fraction of the grade 4 students are in Ms. Ashley's class?

Ms. Ashley's Grade 4 class / (Ms. Ashley's Grade 4 class + Mr. Ben's Grade 4 class)

21 / 21 + 24

21 / 45 = 7/15

4. What fraction of the students in Mr. Ben's class that do not have siblings in the same school?

(Mr. Ben's Grade 4 class - Mr. Ben's Grade 4 class with siblings in the school)/ Mr. Ben's Grade 4 class

24 - 6 / 24

18 / 24 = 3/4

5. In Ms. Ashley's class, are there more students that wear glasses or do not wear glasses?

There are 14 students with glasses and 7 without glasses.

Note: Same answer to question 14038475, answered by me.

3 0

3 years ago

Mr. Jacobs 55 years old and tony is 7 years olds , in how many years will mr. Jacobs 4 times as old as tony ?

V125BC [204]

Call the mystery number of years ' Y ' .

In 'y' years, Mr. Jacobs will be (55+y), and tony will be (7+y).

You said that Mr. Jacobs will then be 4 times as old as tony, so . . .

      55 + y = 4 (7 + y)

Eliminate the parentheses:    55 + y = 28 + 4y

Subtract 28 from each side: 27 + y =   4y

Subtract 'y' from each side: 27     =   3y

Divide each side by 3 :       9       = y

In 9 years, Mr Jacobs will be (55 + 9) = 64.
In 9 years, tony will be (7 + 9) = 16.

64 is 4 times 16, and now that tony has turned 16,
he can start spelling his name with a capital ' T ',
like a regular grown-up.

5 0

3 years ago