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2 years ago

Question 6 of 20 :

Mathematics

2 answers:

katen-ka-za [31]2 years ago

7 0

The answer would be A. 7.64 Inches

valentinak56 [21]2 years ago

4 0

Answer:

A. 7.64

Step-by-step explanation:

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A scientist has saline solutions with concentrations of 4% and 14% . He wants to mix some of each solution to get 65 milliliters

Komok [63]

Let volume of 4% solution = x and of 14% be y

them x + y = 65........(1) also using the actual weights of salt:-

0.04x + 0.14y = 65*0.06 = 3.9

multiplying the above equation by -25 we have

-x - 3.5y = -97.5 adding this to equation (1)

--2.5y = -32.5
y= 13

and x = 65 - 13 = 52

so we need 13 mls of the 14%, and 52 mls of the 4% solution.

8 0

2 years ago

Today there are a total of six toll-free area codes: 800, 844, 855, 866, 877, and 888. Assume that all seven digits for the rest

Ludmilka [50]

Answer:

$6 \times 10^{7}$

Step-by-step explanation:

Total number of toll-free area codes = 6

A complete number will be of the form:

800-abc-defg

Where abcdefg can be any 7 numbers from 0 to 9. This holds true for all the 6 area codes.

Finding the possible toll free numbers for one area code and multiplying that by 6 will give use the total number of toll free numbers for all 6 area codes.

Considering: 800-abc-defg

The first number "a" can take any digit from 0 to 9. So there are 10 possibilities for this place. Similarly, the second number can take any digit from 0 to 9, so there are 10 possibilities for this place as well and same goes for all the 7 numbers.

Since, there are 10 possibilities for each of the 7 places, according to the fundamental principle of counting, the total possible toll free numbers for one area code would be:

Possible toll free numbers for 1 area code = 10 x 10 x 10 x 10 x 10 x 10 x 10 = $10^{7}$

Since, there are 6 toll-free are codes in total, the total number of toll-free numbers for all 6 area codes = $6 \times 10^{7}$

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3 years ago

Five eighths of x is 2 1/2. what is x?

Nitella [24]

Step-by-step explanation:

8/5(put 8 as numerator becuz we need to find all x from 5/8) x 2 1/2＝4

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2 years ago

ine segment MN has endpoints M(-5,4) and N(1,-2). Find the equation for the perpendicular bisector of line segment MN.

Gre4nikov [31]

Answer:

y=x-3

Step-by-step explanation:

slope=4+2/-5-1=-1

perpendicular slope= negative reciprical=1

y=x+b

midpoint on perpendicular bisector= (-5+1/2, 4-2/2)=(-2,1)

substitution-2=1+b, b=-3

y=x-3

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2 years ago

Consider the inequality -20.2 > 0y. Which of the following must be true?

Mekhanik [1.2K]

Answer:Type the correct answer in the box. Use numerals instead of words. If necessary, use / for the fraction bar.

Quincy spends of his pocket money on snacks to keep in his locker. Write the fraction in decimal form.

The decimal equivalent of is .

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Quincy spends of his pocket money on snacks to keep in his locker. Write the fraction in decimal form.

The decimal equivalent of is .

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2 years ago

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