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Arturiano [62]
3 years ago
7

1/4(20−4a)=6−a solve for a

Mathematics
1 answer:
Feliz [49]3 years ago
3 0

1/4(20-4a)=6-a   (distribute 1/4)

5-a=6-a    (subtract 5 to both sides)

-a=1-a     (add "a" to both sides)

0=1

When this happens where the equation is not true, it means that a=no solution because there would be no "a" value that you could plug in to make the equation true.

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High concentrations of carbon monoxide CO can cause coma and possible death. The time required for a person to reach a COHb leve
ale4655 [162]

Answer:

A) 10.38hours

B) 617.95 is the concerntration of CO

Step-by-step explanation:

A) when x=600

T= 0.0002x^2 - 0.316x + 127.9

T= 0.0002(600)^2 -0.316(600) + 127.9

T= 10.38secs

B) to find the concerntration, use Almighty formular

X=-b+-sqrt(b^2-4ac)/2a

0.0002x^2-0.316x-127.9=9

0.0002x^2 - 0.316x + 118.9=0

X= 0.316 +- sqrt(0.316^2) -4(0.0002×118.9)/(2×0.0002)

X= 0.316+(0.68817/0.0004)=962.05 or

X=-0.316 -0.68817/0.0004 =617.95

Therefore X is within the domain of 617.95 is the concerntration

5 0
3 years ago
There are 4 blue marbles, 8 red marbles and 5 green marbles. Write a part to whole ratio comparing green marbles.
fredd [130]

Answer:

5:17

Step-by-step explanation:

there are 17 total marbles and 5 that are green. The part is 5 and the whole is 17.

4 0
2 years ago
Read 2 more answers
Work out the area of the shaded region.
Makovka662 [10]

Answer: Area of the shaded region is 6.867 square cm

Step-by-step explanation:

The shaded area corresponds to the difference of the area of the rectangle and the area of the semicircle.

Area of the rectangle = 4 times 8 = 32 cm^2

Area of the semicircle = 0.5 * pi * r^2   (where r is the radius, i.e., half of the diameters, i.e., 4 cm). So Area = 0.5*pi*4^2 = 25.133 cm^2

The difference: 32 - 25.133 = 6.867 cm^2 (area of the shaded region)

5 0
3 years ago
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alukav5142 [94]

Answer:

D. A over 4

Step-by-step explanation:

One quarter is equal to \frac{1}{4}. If her aunt is age 'a', than Salina's age is a/4

Hope this helps.

4 0
3 years ago
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What is the gcf of 66xy and 30x2y?
Schach [20]

Answer:

66yx , 30x2y, hope its right :)

Step-by-step explanation:

4 0
3 years ago
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