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Mkey [24]
3 years ago
6

(1) 2y×5x(7÷18)-1+3?And (2) 45÷28(3x+6y)=

Mathematics
1 answer:
Alenkinab [10]3 years ago
6 0

Answer:

not really sure for number one

1. 1.56y × 3.9x

2. 4.8x + 9.6y

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Perform the indicated operation. Simplify the result in factored form. ((x - y)/ (x^2 - 1)) * ((x - 1)/(x^2 - y^2))
Scilla [17]

Answer:

The answer to your question is            \frac{1}{(x + 1)(x + y)}            

Step-by-step explanation:

Real operation

                      \frac{x - y}{x^{2} - 1} \frac{x - 1}{x^{2} - y^{2}}

Process

1.- Factor the denominators

                     \frac{x - y}{(x + 1)(x - 1)} \frac{x - 1}{(x + y)(x - y)}

2.- Simplify like terms

Cancel (x - y) and (x - 1) because they are in numerator and the denominator

                    \frac{1}{(x + 1)(x + y)}            This is the answer or you can expand

3.- Expand

                   \frac{1}{x^{2} + xy + x + y^{2}}                    

3 0
3 years ago
Simplify 9 − (−4).<br><br> −13<br> −5<br> 5<br> 13
olchik [2.2K]

Answer:

13

Step-by-step explanation:

two negatives make a positive

4 0
3 years ago
Which measurements are correct? round side lengths to the nearest hundredth. check all that apply. m∠a = 57° m∠b = 15° c ≈ 10.89
Aliun [14]

The correct measurements of the surveyors movement from all the options are; m∠b = 15° and h ≈ 31.28 ft

<h3>What are the correct elevation measurements?</h3>

From the image attached, we see that;

A surveyor found the angle of elevation from the ground to the top from a point = 33°

Now, the surveyor moves 20 ft towards the building and the angle of elevation becomes 48°. This means that ∠A and 48° are supplementary to each other.

Thus;

∠A + 48° = 180°

∠A = 180 - 48

∠A = 132°

From sum of angles in a triangle;

∠B + 33° + 132° = 180°

∠B = 180 - 165°

∠B = 15°

Using sine rule, we know that;

sin 33/C = sin B/20

Thus;

sin 33/C = sin 15/20

Solving for C gives;

C = 42.22

From trigonometric ratios, h/c = sin 48

h = 42.22 sin 48

h = 31.28 ft

Read more about elevations at; brainly.com/question/10254887

5 0
3 years ago
Help please. Need a simple explanation. ​
lbvjy [14]

Answer:

B) 20

Step-by-step explanation:

Each number in the equation needs to be a whole number, since you can't have 2.5 marbles or something like that.

2/5 of 16 is 6.4

2/5 of 20 is 8

2/5 of 21 is 8.4

2/5 of 26 is 10.4

Even though 20 is the only one that works, if you wanted to be sure it's right, just divide by three after subtracting 8 (the three remaining marbles.)

20-8=12

12÷3=4

The three remaining numbers would be equal and the amount of yellow numbers is a whole number. 20 is correct

<u>Please</u><u> give</u><u> brainliest</u><u> if</u><u> I</u><u> helped</u><u>!</u><u> </u><u>:</u><u>)</u>

3 0
2 years ago
PLEASE HURRY!!! <br><br>What is 2.64E20 in standard form?
Vinvika [58]

The answer could be 2.64e+20

4 0
4 years ago
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