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3 years ago

15

What is the product of 8.2 × 109 and 4.5 × 10-5 in scientific notation?

2 answers:

lora16 [44]3 years ago

5 0

Answer:

3.69 * 10^5

Step-by-step explanation:

$8.2*10^{9} *4.5*10^{-5}\\ = 8.2*4.5*10^{9-5}\\=36.9*10^{4}\\= 3.69 *10* 10^{4}\\= 3.69 * 10^{5}$

maksim [4K]3 years ago

3 0

Answer:

$8.2\times \:10^9=8200000000$

$4.5\times \:10^{-5} = 0.000045$

Step-by-step explanation:

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7/8 = _ x _/8 Find the missing values for the multiplication equation

Bumek [7]

<span>A whole number is multiplied to a fraction by multiplying the whole number to numerator of the fraction while retaining the denominator of the fraction 7/8 = (7 x 1)/8 = 7 x 1/8. The number missing in the 1st blank is 7 while the number missing in the second blank is 1.</span>

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3 years ago

You decide to enter in a rowing competition. To train, you go to the boat house and begin rolling down stream. You row for the s

fredd [130]

Answer:

Time spent rowing down stream $=100\ seconds$

Speed of boat in still water $=14\ ms^{-1}$

Step-by-step explanation:

Let speed of boat in still water be $= x\ ms^{-1}$

Speed of current $= 10\ ms^{-1}$

Speed of boat down stream = $\textrm{Speed of boat in still water +Speed of current}= (x+10)\ ms^{-1}$

Distance rowed down stream = 2400 m

Time spent rowing down stream = $\frac{Distance}{Speed}=\frac{2400}{x+10}\ s$ = $\frac{Distance}{Speed}=\frac{2400}{x+10}\ s$

Speed of boat up stream = $\textrm{Speed of boat in still water -Speed of current}= (x-10)\ ms^{-1}$

Distance rowed up stream = $\frac{1}{6} \textrm{ of distance rowed downstream}=\frac{1}{6}\times 2400 = 400\ m$

Time spent rowing up stream = $\frac{Distance}{Speed}=\frac{400}{x-10}\ s$

We know that,

$\textrm{Time spent rowing down stream =Time spent rowing up stream}$

So,

$\frac{2400}{x+10}=\frac{400}{x-10}$

Cross multiplying

$2400(x-10)=400(x+10)$

Dividing both sides by $400$

$\frac{2400(x-10)}{400}=\frac{400(x+10)}{400}$

$6(x-10)=x+10$

$6x-60=x+10$

Adding 60 to both sides.

$6x-60+60=x+10+60$

$6x=x+70$

Subtracting both sides by $x$

$6x-x=x+70-x$

$5x=70$

Dividing both sides by 5.

$\frac{5x}{5}=\frac{70}{5}$

∴ $x=14$

Speed of boat in still water $=14\ ms^-1$

Time spent rowing down stream = $\frac{2400}{14+10}=\frac{2400}{24}=100\ s$

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3 years ago

Are the fractions 4/6 and 6/9 proportional

nata0808 [166]

Answer:

Yes

Step-by-step explanation:

They are proportional by a scale of 1.5

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Zigmanuir [339]

Answer:

A 76

Step-by-step explanation:

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Laura ran t minutes on Monday, and 15 more minutes on Tuesday. Record using algebra: If on Wednesday, Thursday, and Friday Laura

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Monday: t minutes

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2 years ago