All categories

3 years ago

How do you write 81.8 in scientific notation?

Mathematics

1 answer:

Svet_ta [14]3 years ago

7 0

Answer: according to my calculations 2.3456

Step-by-step explanation:

You might be interested in

Complete the Square <br><br> y= 3x^2+12x+20

stepan [7]

Answer:

$y = 3({x + 2)}^{2} + 8$

Step-by-step explanation:

The given function is

$y = 3 {x}^{2} + 12x + 20$

Factor

$y = 3({x}^{2} + 4x )+ 20$

Create a perfect square trinomial

$y = 3({x}^{2} + 4x + 4 ) - 3 \times 4+ 20$

Factor the the perfect square

$y = 3({x + 2)}^{2} - 12+ 20$

The vertex form is:

$y = 3({x + 2)}^{2} + 8$

8 0

4 years ago

Trey mechanic will fix Trey's car at a rate of $20 per hour, plus $400 for the cost of a part. Trey's neighbor already has the n

makvit [3.9K]

Answer:

8 hours.

Step-by-step explanation:

let x represent number of hours.

We have been given that Trey mechanic will fix Trey's car at a rate of $20 per hour, plus $400 for the cost of a part.

So total cost of repairing a car for x hours by Trey mechanic would be $20x+400$ .

We are also told that the neighbor has the needed part and will fix the car for only $70 per hour. So total cost of repairing a car for x hours by neighbor would be $70x$ .

To find the number of hours, when the cost of fixing the car by either person will be equal, we need to equate both expressions as:

$70x=20x+400$

Let us solve for x.

$70x-20x=20x-20x+400$

$50x=400$

$x=\frac{400}{50}$

$x=8$

Therefore, after 8 hours the cost of having the car fixed by either person will be the same.

8 0

3 years ago

Sandy works at a clothing store. She makes $7 per hour plus earns 10% commission on her sales. She worked 78 hours over the last

Gnoma [55]

What’s the question?

3 0

3 years ago

This 5th question ...please answer

leva [86]

Answer:

Im 47 and i have no idea

Step-by-step explanation:

thanks for 5 points

8 0

3 years ago

.634 a rational number

Andrew [12]

It is a rational number, because it's a terminating decimal and as such can be expressed as a fraction the numerator and the denominator of which are integers.

4 0

3 years ago