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pochemuha
2 years ago
9

The sum of two numbers is 80.6. One of

Mathematics
1 answer:
goblinko [34]2 years ago
6 0
X+y= 80.6
9x=y
Then x+9x=10x=80.6
X=8.06
Y=72.54
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Which ratio forms a proportion with 5: 15?<br><br> A: 10:20<br> B: 75:5<br> C: 3:1<br> D: 1:3
Lerok [7]

Answer:

D

Step-by-step explanation:

5/5 : 15/5

gives

1:3

......

4 0
3 years ago
Find the m∡B to the nearest tenth of a degree if cos B = 0.8926 and ∡B is an acute angle
mrs_skeptik [129]

Answer:

26.8°

Step-by-step explanation:

The cosine of an angle is the ratio of the adjacent side of the triangle in which the angle is formed to the hypotenuses side of the triangle. The cosine of the angle gives the ratio of these sides. However, the arc cosine of the ratio gives the angle measured in degrees.

If cos B = 0.8926

then arc cosine 0.8926  which may be expressed as cos-1 0.8926 will give the value of B.

B = cos-1 0.8926

= 26.8°

7 0
3 years ago
Can someone explain (with steps) how to rationalize the following expression?
insens350 [35]
F(x)=(-2/((x+y-2)^(1/2))-(x+y+2)^(1/2)
the only irrational part of this expression is the (x+y-2)^(1/2) in the denominator, so, to rationalize this, you multiply the numerator and denominator by the denominator, as well as the other parts of the expression
also, you must multiply the -sqrt(x+y+2) by sqrt(x+y-2)/sqrt(x+y-2) to form a common denominator
(-2)/(x+y-2)^(1/2)-(x+y+2)^(1/2)(x+y-2)^(1/2)/(x+y-2)^(1/2)
(common denominator)
(-2-(x^2+xy+2x+xy+y^2+2y-2x-2y-4))/(x+y-2)^(1/2)
(FOIL)
(-2-x^2-y^2-2xy+4)/(x+y-2)^(1/2)
(Distribute negative)
(-x^2-y^2-2xy+2)/(x+y-2)^(1/2)
(Simplify numerator)
(-x^2-y^2-2xy+2)(x+y-2)^(1/2)/(x+y-2)^(1/2)(x+y-2)^(1/2)
(Rationalize denominator by multiplying both top and bottom by sqrt)
(-x^2-y^2-2xy+2)((x+y-2)^(1/2))/(x+y-2)
(The function is now rational)
=(-x^2-y^2-2xy+2)(sqrt(x+y-2))/(x+y-2)
6 0
3 years ago
What is 2.57142857143 as an improper fraction in its simplest form?
Sidana [21]

Answer:

257142857143 / 100000000000.

Step-by-step explanation:

2.57142857143

= 2 +  57142857143 / 100,000,000,000

= 200,000,000,000 +  57142857143 / 100,000,000,000

= 257142857143 / 100000000000.

6 0
3 years ago
Please help fast I’m not sure exactly how to do this or find it
Vanyuwa [196]
The answer would be B check the picture for work.

7 0
3 years ago
Read 2 more answers
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