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elena-14-01-66 [18.8K]
3 years ago
12

What is 0.00000387 in scientific notation? A. 0.387 × 10–7 B. 3.87 × 10–6 C. 3.87 × 106 D. 387 × 10–8]

Mathematics
1 answer:
REY [17]3 years ago
8 0

Answer:

C

Step-by-step explanation:

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It would be a ray, because it’s continually moving in one direction.
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5 0
3 years ago
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Emily practices piano for 2/3 of an hour on Monday and 1/2 hour on Wednesdays. How many hours does Emily spend practicing piano
Sergeu [11.5K]

Answer:

50 minutes

Step-by-step explanation:

Given:

\bullet \ \ \text{Monday:} \ \dfrac{2}{3} \times \text{Hour}\\\\\bullet \ \text{Wednesday:} \ \dfrac{1}{2} \times \text{Hour}

Since Emily only practiced on Monday and Wednesday, the sum of time on both days is the time Emily practiced on the piano for a week.

\implies \text{Monday + Wednesday = Total time practiced on piano for a week}

<u>Substitute the times in the equation</u>

\implies (\dfrac{2}{3}  \times \text{Hour}) + (\dfrac{1}{2}  \times \text{Hour}) = \text{Total time practiced on piano for a week}

<u>Simplify the equation</u>

\implies (\dfrac{2}{3}  \times 60 \ \text{minutes}) + (\dfrac{1}{2}  \times 60 \ \text{minutes}) = \text{Total time practiced on piano for a week}

\implies (20 \ \text{minutes}) + (30 \ \text{minutes}) = \text{Total time practiced on piano for a week}

\implies \boxed{50 \ \text{minutes} = \text{Total time practiced on piano for a week}}

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Answer:

The triangle is acute because all of the angles are less than 90º

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Find the equation of the line with slope 2 that passes through the point (4,-8)
sesenic [268]

Step-by-step explanation:

Given point (4 , -8) , slope (m) = 2

Now

the equation of line is

y - y1 = m ( x - x1)

y +8 = 2 ( x -4)

y + 8 = 2x - 8

2x - 8 - 8 -y = 0

2x - y - 16 = 0

which is the required equation

3 0
3 years ago
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