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Alenkasestr [34]
2 years ago
12

Giải phương trình x/30-x/40=5/4

Mathematics
1 answer:
Amiraneli [1.4K]2 years ago
3 0

Answer:

x=150

Step-by-step explanation:

x/30-x/40=5/4

or, (4x-3x)/120=5/4

or, x/120=5/4

or, x=600/4

or, x=150

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Answer:

y=(x+3)^{2} -1

Step-by-step explanation:

General equation of a parabola that opens up is y=a(x-h)^{2} +k , a>0

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So, the equation of parabola will be of the form y=(x+h)^{2} - k

Hence, option 4 that is y=(x+3)^{2} -1 is correct.


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\frac{c}{a} and \frac{b}{a}

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---------------------------------------------------------------------------

sinC = \frac{opposite}{hypotenuse} = \frac{AB}{BC} = \frac{c}{a}

tanB = \frac{opposite}{adjacent} = \frac{AC}{AB} = \frac{b}{c}

Thus

sinC tanB = \frac{c}{a} × \frac{b}{c} ( cancel c on numerator/ denominator )

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