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vitfil [10]
3 years ago
14

I need help with this fast, please! Small amounts of substances can be measured in milligrams. One milligram equals gram. Suppos

e a scientist needs 25 milligrams of a substance. Find the amount in grams. Write your answer in scientific notation.
Mathematics
1 answer:
artcher [175]3 years ago
7 0

Answer:

0.025 grams

Step-by-step explanation:

1milligrams equals 0.01grams

25milligrams equals 0.025 grams

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Solve compound inequality x ≥ -3 or x < 3
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A street light is mounted at the top of a 15-ft-tall pole. A man 6 feet tall walks away from the pole with a speed of 5 ft/s alo
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Answer:

25/3 ft/s

Step-by-step explanation:

Height of pole , h=15 ft

Height of man, h'=6 ft

Let BD=x

BE=y

DE=BE-BD=y-x

All right triangles are similar

When two triangles are similar then the ratio of their corresponding sides are equal.

Therefore,

\frac{AB}{CD}=\frac{BE}{DE}

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Differentiate w.r.t t

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Using the value

\frac{dy}{dt}=\frac{5}{3}(5)=\frac{25}{3}ft/s

Hence, the tip of  his shadow moving  with a speed 25/3 ft/s when he is 45 feet from the pole.

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A cereal mixture contains almond, wheat and corn in the ratio of 3:5:7. What amount of this mixture contains 9 kg of almond?
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Answer:

45 Kg of the of this mixture contains 9 kg of almond

Step-by-step explanation:

Given:

The ratio of  almond, wheat and corn = 3:5:7.

To Find:

Amount of this mixture contains 9 kg of almond =?

Solution:

The total of  the fraction = 3+5+7  = 15

Let the total amount of the mixture be X, then

Then

\frac{ \text{ratio of the almond in the mixture}}{\text{total ratio}}  \times X = 9

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X = 9 \times \frac{15}{3}

X = 9 \times 5

X =  45

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4 years ago
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