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2 years ago

What is the proper to do 81x400

Mathematics

2 answers:

ludmilkaskok [199]2 years ago

6 0

Answer:

Step-by-step explanation:

To perform this multiplication I would rewrite the expression as

81*4*100. This is easier to do mentally: 4 times 81 is 324, and then 324 times 100 is 32,400. There are of course other approaches involving factoring the original expression and performing multiplication.

Cerrena [4.2K]2 years ago

5 0

Answer:

81 x400

=32400

Step-by-step explanation:

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Factor the polynomial expression 3x² + 2.

mel-nik [20]

Answer:

$\boxed{\left(x+i\sqrt{\frac{2}{3}}i \right)\left(x-i\sqrt{\frac{2}{3}}i \right)}$

Step-by-step explanation:

Setting the expression equal to zero to find the roots,

$3x^2 +2=0\\\\3x^2 =-2\\\\x^2 =-\frac{2}{3}\\\\x=\pm i\sqrt{\frac{2}{3}}$

This means that

$3x^2 +2=\boxed{\left(x+i\sqrt{\frac{2}{3}}i \right)\left(x-i\sqrt{\frac{2}{3}}i \right)}$

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1 year ago

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7 0

3 years ago

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You and a friend go out to eat, the food and drinks cost $22.50, and there is a 9% sales tax. How much is the bill? (Round to th

Ludmilka [50]

Answer:

24.53

Step-by-step explanation:

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2 years ago

Our hearts beat approximately 70 times per minute. Express in scientific notation how many times the heart beats over a lifetime

earnstyle [38]

Answer:

2.69 x $10^{9}$

Step-by-step explanation:

We are given the heart's speed - 70 bpm

We count the number of minutes in 73 years :

1 year = 365 days
1 day = 24 hours
1 hour = 60 minutes
73 x 365 x 24 x 60 = 38,368,800 minutes

We multiply the heart's bpm with 73 years worth of minutes

38,368,800 x 70 = 2,685,816,000

Write the number in scientific notation = 2.68581 x $10^{9}$ ≈ 2.69 x $10^{9}$

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3 years ago

Kevin is 333 years older than Daniel. Two years ago, Kevin was 444 times as old as Daniel.

tia_tia [17]

Answer: the equations are

k = d + 33

k - 2 = 4(d-2)

Step-by-step explanation:

Let the present age of Kevin be represented by k

Let the present age of Daniel be represented by d

Kevin is 33 years older than Daniel. This means that the expression for their current age is

k = d + 33

Two years ago, Kevin was 4 times as old as Daniel. This means that 2 will be subtracted from their present ages to depict two years ago. Therefore, Two years ago for Daniel will be d-2

Two years ago for Kevin will be k - 2

Remember that Kevin was 4 times as old as Daniel two years ago, it becomes

k - 2 = 4(d-2)

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3 years ago

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