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Dominik [7]
4 years ago
7

The depth of a swimming pool is 8.5 meters. What is half of the depth in millimeters?

Mathematics
2 answers:
Andru [333]4 years ago
5 0
8.5m=850cm Divide by 2= 425cm. Which is equal to 4250mm

Nadya [2.5K]4 years ago
3 0
.This is how I do problems like these: Basically 8.5 is the same as 8.50. I look at the .50 and I take half of 50. Half of 50 is 25 and half of 8 is 4. So the answer would be 4.25. I hope this helps!
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The ratio of tagged fish to untagged fish was 2 to 9. Ninety fish were tagged. How many fish were untagged
Nimfa-mama [501]

Answer:

405

Step-by-step explanation:

Since

2 : 9 = 90 : X

Then we know

9/2 = X/90

Multiplying both sides by 90 cancels on the right

90 × (9/2) = (X/90) × 90

90 × (9/2) = X

Then solving for X

X = 90 × (9/2)

X = 405

Therefore

2 : 9 = 90 : 405

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3 years ago
Who wants to play kah*ot <br> game code is 5794844
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Answer:

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Step-by-step explanation:

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3 years ago
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Element X is a radioactive isotope such that its mass decreases by 59% every day. If an experiment starts out with 390 grams of
miss Akunina [59]

Answer:

The function that represents the mass of the sample after t days is A(t) = 390(0.41)^t.

The percentage rate of change per hour is of -2.46%.

Step-by-step explanation:

Exponential amount of decay:

The exponential amount of decay for an amount of a substance after t days is given by:

A(t) = A(0)(1-r)^t

In which A(0) is the initial amount, and r is the decay rate, as a decimal.

Element X is a radioactive isotope such that its mass decreases by 59% every day. The experiments starts out with 390 grams of Element X.

This means, respectively, that r = 0.59, A(0) = 390

So

A(t) = A(0)(1-r)^t

A(t) = 390(1-0.59)^t

A(t) = 390(0.41)^t

The function that represents the mass of the sample after t days is A(t) = 390(0.41)^t.

Hourly rate of change:

Decreases by 59% every day, which means that for 24 hours, the rate of change is of -59%. So

-59%/24 = -2.46%

The percentage rate of change per hour is of -2.46%.

5 0
3 years ago
If the measure of angle 5 is (11X-14)º and x = 6, which expression could represent the measure of angle 2?
Sauron [17]
11(6)-14=56
The answer should be 9x+2 which would be 56–> 9(6)+2=56
5 0
3 years ago
Find the dot product of U and V <br><br> u=7i, v = -2i + 5j
alexandr1967 [171]

Answer:

-14

Step-by-step explanation:

Multiply the is together. Multiply the j's together. Add the answer. The answer is a scalar.

(7 × -2) + (5 × 0)

= -14

6 0
3 years ago
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