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dem82 [27]
3 years ago
9

There are 560 third- and fourth-grade students in King Elementary School. If there are 80 more third-graders than fourth-graders

, how many third-graders are there in the school? work has to be shown
Mathematics
1 answer:
Marianna [84]3 years ago
8 0

Answer:

There are 200 4th grades and 360 third graders

Step-by-step explanation:

560/2=280-80=200 280+80=360

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A bag contains 12 toffees. Kate eats 3 toffees and Josh eats 4 toffees.
Vinvika [58]

Answer:

5/12

Step-by-step explanation:

3 + 5 = 7

12/12 - 7/12 = 5/12

4 0
2 years ago
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-2.8f + 0.7f - 14 - 4
den301095 [7]

Answer:

Step-by-step explanation:

-2.8f + 0.7f - 14 - 4

- 2.1f - 18

3 0
3 years ago
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Which point lies on the circle represented by the equation (x+5) + (y-9) = 8
olga_2 [115]

Answer:

(-5,9+√8)

Step-by-step explanation:

There are two ways in which you can find a point that lies in the circle. One of them is to do y the subject of the formula, and another one is to determine the center of the circumference, and with the information of the radius, you can sum this value upward or downward.

the general equation of a circle is:

(x-h)^2+(y-k)^2=r^2

with center at (h,k)

you have the following equation:

(x+5)^2+(y-9)^2=8\\\\h=-5\\\\k=9\\\\r=\sqrt{8}

Then, the center is (-5,9)

if you sum the value of the radius in one of the fourth directions (up, down, left, right), for example upward you have

(-5,9+r)=(-5,9+\sqrt{8})

Then, one point that lies in the circle is (-5,9+√8)

3 0
3 years ago
PLEASE WHAT IS THE AREA OF THIS HELP ME PLEASE
BARSIC [14]

Answer:

it should be 14,580 m^2

(the ^2 means squared btw)

7 0
3 years ago
A multiple choice test has four possible answers for each question. Let X be the number of correct responses in a test of 100 qu
dimulka [17.4K]

Answer:

a. 4.33.

Step-by-step explanation:

If there is only one correct answer out of four alternatives, the expected proportion of correct answers is p =0.25

Sample size (n) = 100 questions

The standard deviation of a proportion 'p' is given by:

s=\sqrt{\frac{p*(1-p)}{n} }

Applying the given data:

s=\sqrt{\frac{0.25*(1-0.25)}{100}}\\s=0.0433

If X is the number of correct responses in 100 guesses, the standard deviation of X is:

\sigma = n*s=100*0.0433\\\sigma = 4.33

The standard deviation of X is 4.33 questions.

7 0
3 years ago
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