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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.

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:

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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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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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3 years ago

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4 years ago

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?

kirza4 [7]

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

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

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

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

$X = 9 \times 5$

X = 45

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4 years ago