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3 years ago

Evaluate the following numerical expression (6+ 3) ÷ (4 - 5) =

Mathematics

1 answer:

Dvinal [7]3 years ago

5 0

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Because you do what’s in parentheses first which is (6+3)

You get the answer 9

Then you do 4-5 which will lead to going into negative numbers and the answer will be -1

So 9/-1 or Nine divided by negative one

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In a lab a substance was cooled by 4 degrees c each hour for 16 hours what was the total change in temperature

nata0808 [166]

Answer:

64 degrees

Step-by-step explanation

multiply 4 by 16 because for every hour it was cooled another 4 degrees so 4 times 16 equals 64

8 0

3 years ago

A washer and dryer cost a total of $1014. The cost of the washer is two times the cost of the dryer. Find the cost of each item.

timurjin [86]

Answer:

Washer is $676

Dryer is $338

Step-by-step explanation:

1014 divide by 3 gives you 338.

338 x 2 = $676

676 is twice 338.

676 + 338 = 1014

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2 years ago

Pythagorean triples are given by the formula x^2-y^2, 2xy, and x^2+y^2. Use the formulas for the Pythagorean triples to find a r

Rasek [7]

Answer:

Let the unknown length be x

We have a formula to find the triplet of a right angle triangle

Put the given length equal to all three terms in the triplet

$2m,m^2-1,m^2+1$

put 16 equal to all above three but number comes out has to be integer.

$2m=16$

$\Rightarrow m=8$

Now, $m^2-1=16$

$m^2=17$ will not give integer.

And now, $m^2+1=16$

$m^2=15$ will not get integer value

Hence, the value of m will be 8

And substituting the value in the triplet formula we get

$2m=2\cdot 8=16$ which is given.

$m^2-1=64-1=63$ the other leg and is odd.

And $m^2+1=64+1=65$ the hypotenuse or the longest side.

Hence, 16,63 and 65 will form a right triangle

Pythagoras theorem is:

$\text{one side}^2+\text{other side}^2=hypotenuse^2$

Here, 16 and 63 are sides or legs and 65 is the hypotenuse.

8 0

2 years ago

A.(7,8) <br> B.(2,22)<br> C.(2,8)<br> D.(3,29)

11Alexandr11 [23.1K]

To solve this system using the subst. method, equate y = 7x + 8 to y = x + 20.

Then 6x = 12, and x = 2. To find y, subst. 2 for x in either of the given equations.

Write your solution as (2, y).

6 0

3 years ago

Express the confidence interva l0.555< p < 0.99 in the form p+-E.

kati45 [8]

The confidence interval in the form p+E is p ± E = 0.7725 ±0.435

<h3>How to rewrite the confidence interval?</h3>

The confidence interval is given as:

0.555< p < 0.99

To rewrite the above expression in the form p+E, we use the following equations

p = (0.99 + 0.555)/2 = 0.7725

E = (0.99 - 0.555) = 0.435

So, we have:

p ± E = 0.7725 ±0.435

Hence, the confidence interval in the form p+E is p ± E = 0.7725 ±0.435

Read more about confidence interval at

brainly.com/question/17097944

#SPJ1

8 0

1 year ago

Evaluate the following numerical expression (6+ 3) ÷ (4 - 5) =​

Evaluate the following numerical expression (6+ 3) ÷ (4 - 5) =