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3 years ago

10

Evaluate 20/y - 8/x + 3xy/x+y when x=2 and y=5

1 answer:

Lesechka [4]3 years ago

6 0

20(5)-8(2)+3(2-5)+5
100-16-9= 79

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The width of a rectangle is 7 meters greater than its length. If the area of the rectangle is 170 square meters, write the quadr

mamaluj [8]

In this case you divide 170 by 7 which = 24.29 so 24.29 is your answer, good luck.

5 0

3 years ago

Find the difference. 8.25 - (-1.9) <br> A.8.44 <br> B.6.35 <br> C.10.15 <br> D.-6.35

quester [9]

Answer:

C. 10.15

Step-by-step explanation:

If you left 8.25 and changed the minus sign to a addition sign and the -1.9 to just 1.9 and then add 8.25 + 1.9 together you will then get 10.15 a way to remember this is “leave, change, change,” you leave the first number and change the subtraction and negative number sign. :)

3 0

3 years ago

Read 2 more answers

Need help please assist me find the area of a regular hexagon

garri49 [273]

Answer:

The area of the regular hexagon is $166.3\ units^{2}$

Step-by-step explanation:

we know that

The area of a regular hexagon can be divided into 6 equilateral triangles

so

step 1

Find the area of one equilateral triangle

$A=\frac{1}{2}(b)(h)$

we have

$b=r=8\ units$

$h=4\sqrt{3}\ units$ ----> is the apothem

substitute

$A=\frac{1}{2}(8)(4\sqrt{3})$

$A=16\sqrt{3}\ units^{2}$

step 2

Find the area of 6 equilateral triangles

$A=(6)16\sqrt{3}=96\sqrt{3}=166.3\ units^{2}$

7 0

3 years ago

A certain radioactive material decays in such a way that the mass in kilograms remaining after t years is given by the function

Angelina_Jolie [31]

The mass of radioactive material remaining after 50 years would be 48.79 kilograms

<h3>How to determine the amount</h3>

It is important to note that half - life is the time it takes for the amount of a substance to reduce by half its original size.

Given the radioactive decay formula as

m(t)=120e−0.018t

Where

t= 50 years

m(t) is the remaining amount

Substitute the value of t

$m(t) = 120e^-^0^.^0^1^8^(^5^0^)$

$m(t) = 120e^-^0^.^9$

Find the exponential value

m(t) = 48.788399

m(t) = 48.79 kilograms to 2 decimal places

Thus, the mass of radioactive material remaining after 50 years would be 48.79 kilograms

Learn more about half-life here:

brainly.com/question/26148784

#SPJ1

7 0

2 years ago

How many different passwords can be made if it is three letters, followed by two digits, followed by a letter?

ohaa [14]

Infinitely many passwords can be made.

8 0

2 years ago