Help!! Math question

Mathematics

2 answers:

aksik [14]4 years ago

5 0

18 - 7x = -20.52.5 = 7xx = 5/14 (c)

Zielflug [23.3K]4 years ago

3 0

18-7x=-20.5

-18 from both sides

Dive by -7 to both sides

D. 5 1/2

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What is the difference of the rational expressions below?

Stolb23 [73]

Answer: A

Step-by-step explanation:

We need to get the denominators to be same first before we can do anything to the numerator.

The LCD (lowest common denominator) is $3x^{3}$ . To find the LCD, multiply the denominators together: $x^{3}$ · $3x$ = $3x^{3$ .

Below, we are trying to get the denominators to equal the same or to $3x^{3}$ .

$\frac{3}{3} (\frac{4}{x^{3} } ) - \frac{x^{2} }{x^{2} } (\frac{2x-1}{3x} )$

$\frac{12}{3x^{3} } - \frac{2x^{3}-x^{2} }{3x^{3} }$

Now that the denominators are the same, we can subtract the numerators from each other.

$\frac{ 12 - (2x^{3} -x^{2})\\}{3x^{3} } \\$

$\frac{12-2x^{3} +x^{2} }{3x^{3} }$

Now, we can just reorganize the variables.

Answer: A or $\frac{-2x^{3} + x^{2}+12 }{3x^{3} }$

7 0

3 years ago

Simplify 270 ÷ 3[(4 - 3)3 - (-9)] - 53

Andreyy89

270 / 3 ( (4 - 3) 3 - (-9) ) - 53
270 / 3 (1 x 3 - (-9) ) - 53
270 / 3 (3 + 9) - 53
270 / 3 x 12 - 53
In PEMDAS, with multiplication and division, you must go left to right, not multiplication then division.
90 x 12 - 53
1080 - 53
1027 is your answer

4 0

4 years ago

Read 2 more answers

Please help me I’ve been trying

Sindrei [870]

AC = 2.87

Solution:

Given AB = 5

To find the length of AC:

The given triangle is a right triangle.

So we can use trigonometric formula.

$$\sin \theta=\frac{\text { Opposite }}{\text { Hypotenuse }}$