All categories

3 years ago

Evaluate 0.212121... + 0.021021021... − 0.145714571457...

Mathematics

1 answer:

Alexandra [31]3 years ago

7 0

Finding the exact value of each number goes like this:

x = 0.212121...

100x = 21.212121...

==> 100x - x = 21.212121... - 0.212121...

==> 99x = 21

==> x = 21/99 = 7/33

Similarly:

y = 0.021021021...

1000y = 21.021021021...

==> 999y = 21

==> y = 21/999 = 7/333

and

z = 0.145714571457...

10000z = 1457.145714571457...

==> 9999z = 1457

==> z = 1457/9999

Then we end up with

x + y - z = 32345/369963

You might be interested in

Select all that apply.

Kryger [21]

Answer:

Your answer would be

$1 \times 3 = 3$

And

$3 \times 5 = 15$

Step-by-step explanation:

Hope this helps. If I am wrong, REPORT ME PLEASE.

6 0

2 years ago

PLEASE ANSWER QUICKLY

GaryK [48]

We have that
1/4 x + 2/3 y = 5 ----> multiply by 12 both sides---> 3x+8y=60
1/2 x + 3/2 y = 11---> multiply by 2 both sides----> x+3y=22

therefore

the answer is the option
B. 3x + 8y = 60 ; x + 3y = 22

8 0

3 years ago

Read 2 more answers

Solve the system of linear equations by elimination. 9x−2y=349x−2y=34 5x+2y=−6

stealth61 [152]

So combine all the x and the Y on the left side and the coefficients on the right and then multiply the variable (x or Y) by the number needed for both. and then whichever variable you have left (x or y) will equal the coefficient and then divide by the coefficient

4 0

3 years ago

The length of a rectangular park is 3 feet shorter than times its width. If the length is 123 feet, what is the width of the par

VLD [36.1K]

Answer:

Width is 120ft but may be different if the "times the width" information is given. Follow the same process.

Step-by-step explanation:

To solve the problem, write an expression that relates length and width using the information given to you. "The length of a rectangular park is 3 feet shorter than times its width" means that l = 3 + w. Since no number is given for "times its width" we disregard this portion. If you have the information then you would include it here l = 3 + _w.

So using the expression l = 3 + w, substitute l = 123. Then the width will be:

l = 3 + w

123 = 3 + w

120 = w

6 0

3 years ago

What is the answer to x/-3 + 5 = 12

Mariana [72]

Answer:

Step-by-step explanation:

6 0

3 years ago