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jek_recluse [69]
3 years ago
8

Solve for x : 7/8 = 21/x

Mathematics
2 answers:
castortr0y [4]3 years ago
8 0
Hey!

We could write the problem like this,
\frac{7}{8}=\frac{21}{x}
Cross multiply!
7x=8\cdot \:21
We know that 8\cdot \:21=168, let's plug that in.
7x=168
Divide both sides by 7.
\frac{7x}{7}=\frac{168}{7}

Our final answer would be,
x=24

Thanks!
-TetraFish
Ira Lisetskai [31]3 years ago
3 0
\frac{21}{1} \frac{7}{8} =  \frac{21}{x} ( \frac{21}{1} ) 
 \\ Cross-out, the  DOUBLE 21's \\ 7(x) = 21 \\ 21(8) = ? \\ 7(x) = 168  \\  \frac{168}{7}  = 24 \\ Answer: x = 24 Choice. 2
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Black_prince [1.1K]

Answer:

x = - 2, x = 3

Step-by-step explanation:

Given

x² - x - 6 = 0

Consider the factors of the constant term (- 6) which sum to give the coefficient of the x- term (- 1)

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Equate each factor to zero and solve for x

x + 2 = 0 ⇒ x = - 2

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8 0
2 years ago
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A number is 6 less than its square. find all such numbers?
cestrela7 [59]
Hello There!

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3 years ago
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Can someone answer it
Troyanec [42]
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Which statement is true about the graphs of the two lines y = –6 and x =1/6 ?
sweet-ann [11.9K]
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katrin [286]

Answer:

A. (2x + 5)(2x - 5)

Step-by-step explanation:

Factor out the polynomial given.

(4x² - 25) = (2x - 5)(2x + 5)

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