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2 years ago

Help plz due in 20 min

Mathematics

2 answers:

nevsk [136]2 years ago

8 0

Answer: 3 Exact Form:

3√7

Decimal Form 7.93

Step-by-step explanation:

ipn [44]2 years ago

4 0

Answer:

$3\sqrt{7}$

Step-by-step explanation:

× $\sqrt{63} = \sqrt{9times7} \\\sqrt{9} = 3\\3\sqrt{7}$

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A parallelogram has a base of 12 meters and a height of 1.5 meters. What is its area?

rusak2 [61]

Answer:

Step-by-step explanation:

12×1.5=18

its the same formula with rectangle cz if you combine both right angled triangle side its become a rectangle

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2 years ago

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Answer:

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Step-by-step explanation:

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2 years ago

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2 years ago

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Explain the differences between adding and multiplying radical expressions using 2 examples you create.

ivann1987 [24]

Answer:

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Step-by-step explanation:

6 0

1 year ago

A Cepheid variable star is a star whose brightness alternately increases and decreases. For a certain star, the interval between

victus00 [196]

Answer:

a) $\frac{dB}{dt} = \frac{5\pi}{4.2} \cdot \cos \left(2\pi\cdot \frac{t}{4.2} \right)$ , b) $\frac{dB}{dt}\approx 5.595$

Step-by-step explanation:

a) The rate of change of the brightness of the Cepheid can be determined by deriving the function in time:

$\frac{dB}{dt} = \left(\frac{2\pi}{4.2} \right)\cdot 0.25\cdot \cos (2\pi\cdot \frac{t}{4.2})$

$\frac{dB}{dt} = \frac{5\pi}{4.2} \cdot \cos \left(2\pi\cdot \frac{t}{4.2} \right)$

b) The rate of increase after one day is:

$\frac{dB}{dt} = \frac{5\pi}{4.2} \cdot \left(2\pi \cdot \frac{1}{4.2} \right)$

$\frac{dB}{dt}\approx 5.595$

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2 years ago