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SSSSS [86.1K]
3 years ago
11

What is the product of the rational expressions below? x-9/x-2*x+9/x+2

Mathematics
1 answer:
e-lub [12.9K]3 years ago
7 0
\frac{(x-9)(x+9)}{(x-2)(x+2)}

\frac{x^2-81}{x^2-4}
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Help please i’ll really appreciate it
maw [93]

Answer:

radius is 4 height is 10 volume is 167.55

Step-by-step explanation:

3 0
3 years ago
The sum of two numbers is 50. One number is 10 less than three times the other number. What are the two numbers? 25 and 25 45 an
DENIUS [597]
One number is x
other number is 3x-10

x + 3x - 10 = 50
4x = 50 + 10
4x = 60
x = 60/4
x = 15   ← one number

 the other number = 3x - 10 = 3*15 - 10 = 35


6 0
4 years ago
Find the number if: 4.5% of it is 23% of 45
Usimov [2.4K]
Well, let's say the number is "x", so "x" is the 100%.

now, what the dickens is 23% of 45 anyway?

if we take 45 to be the 100%, what is its 23%?

\bf \begin{array}{ccll}
amount&\%\\
\text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\
45&100\\
a&23
\end{array}\implies \cfrac{45}{a}=\cfrac{100}{23}\implies \cfrac{45\cdot 23}{100}=a\implies 10.35=a

ok, well, we know then that 4.5% of "x" is 10.35, we also know that "x" is the 100%, what is "x" anyway?

\bf \begin{array}{ccll}
amount&\%\\
\text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\
x&100\\
10.35&4.5
\end{array}\implies \cfrac{x}{10.35}=\cfrac{100}{4.5}\implies x=\cfrac{10.35\cdot 100}{4.5}
3 0
4 years ago
Read 2 more answers
The average (arithmetic mean) ages, in years, of the people in group A and group B are 41 and 36, respectively. The average age,
Oxana [17]

Answer:

3/5

Step-by-step explanation:

avg in A = 41

avg in B = 38

combined avg of A and B = 36

Let a = number of people in group A.

Let b = number of people in group B.

The total number of people = a + b.

The sum of all ages in group A is 41a.

The sum of all ages in group B is 36b.

The sum of all ages in the combined group A and B is 38(a + b).

41a + 36b = 38(a + b)

41a + 36b = 38a + 38b

3a = 2b

a/b = 2/3

a/b + 1 = 2/3 + 1

a/b + b/b = 2/3 + 3/3

(a + b)/b = 5/3

b/(a + b) = 3/5

5 0
3 years ago
An elm tree is 3 and 1/2 times as tall as an apple tree . The apple tree is 10 and 2/3 feet tall how tall is the elm tree
lys-0071 [83]

Answer:

111  1/3 feet tall

Step-by-step explanation:

4 0
3 years ago
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