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3 years ago

Evaluate the expression, using the given value of the variable.

Mathematics

2 answers:

Alborosie3 years ago

4 0

A. - 12

3 - 21+6 = -18+6 = -12

Alborosie3 years ago

3 0

3 - 7x + 2x

Plug in 3 for 'x'

3 - 7(3) + 2(3)

3 - 21 + 6

-18 + 6

-12

So our answer is A

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The values of a,b, and c in scientific notation are 3.47 x 10^-6, 4.61 x 10^-7, and 5.52 x 10^-7, respectively. Complete the fol

Mars2501 [29]

Answer:

a) 1.59967 * 10 ^-12

b) 7.52711497

c) 1.590778098 * 10^-1

Step-by-step explanation:

a= 3.47 x 10^-6,

b=4.61 x 10^-7,

c=5.52 x 10^-7

a) a*b = 3.47 x 10^-6* 4.61 x 10^-7

We multiply the numbers out front and add the exponents

(3.47*4.61) * 10^(-6+-7)

15.9967 * 10^-13

But this is not correct scientific notation, we need 1 number in front of the decimal. Move the decimal 1 place to the left and add 1 to the exponent

1.59967 * 10^(-13+1)

1.59967 * 10 ^-12

b) a/b = 3.47 x 10^-6/ 4.61 x 10^-7

We divide the numbers out front and subtract the exponents

(3.47/4.61) * 10^(-6- -7)

(3.47/4.61) * 10^(-6+7)

.752711497* 10^1

But this is not correct scientific notation, we need 1 number in front of the decimal. Move the decimal 1 place to the right and subtract 1 from the exponent

7.52711497* 10^1-1

7.52711497

c) c/a = 5.52 x 10^-7/3.47 x 10^-6

We divide the numbers out front and subtract the exponents

(5.52/3.47) * 10^(-7- -6)

(5.52/3.47) * 10^(-7+6)

1.590778098 * 10^-1

3 0

3 years ago

The value of Maggie's car decreased by 25% since last year, when she bought it. If the car is now worth $19,000.00, how much was

ivolga24 [154]

Do 1.25(19,000.00) and you get 23,750

7 0

3 years ago

Meg makes a flour blend at home using barley and wheat flour in a ratio of 2:3. How many ounces of barley does she use when she

amm1812

Answer:

18 ounces of barley

Step-by-step explanation:

If Meg uses barley and wheat flour in a ratio of 2:3, we can set up equivalent ratios in order to find how many ounces of barley Meg would need if she uses 27 ounces of wheat flour:

$\frac{barley}{wheat flour}$ = $\frac{2}{3}$ = $\frac{x}{27}$

We can solve for 'x' (the number of ounces of barley) using a few different methods. We can cross-multiply and divide: 27(2) = 3x, or x = 18. We can also see what factor we multiply the 3 by to get 27 and multiply the numerator (2) by the same number. Since 3 x 9 = 27, then 2 x 9 = 18.

3 0

4 years ago

Which of the following has four, eight and one nine?? A.88889 B.4819 C.888819 D.489

Dahasolnce [82]

Answer:

D. 489

Step-by-step explanation:

489 has the number,

four - 4

eight - 8

and ONE nine - 9

Hope this helps :)

7 0

3 years ago

Read 2 more answers

Question 14 options: The personnel department of a large corporation wants to estimate the family dental expenses of its employe

never [62]

Answer:

The sample mean is of 266.5 dollars.

Step-by-step explanation:

Sample mean:

The sample mean is given by the sum of all values in the sample divided by the number of values.

In this question:

12 values.

The sum is:

115 + 370 + 250 + 93 + 540 + 225 + 177 + 425 + 318 + 182 + 275 + 228 = 3198

The sample mean is:

$S = \frac{3198}{12} = 266.5$

The sample mean is of 266.5 dollars.

3 0

3 years ago