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3 years ago

8

A scientist has 350 mg of a radioactive material. The material will cut in half every month. After how many months will there be

.68mg left?

1 answer:

Zanzabum3 years ago

6 0

The answer would be about 9 months.

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- Last week Shelley earned $60.00 in tips waitressing. This week she earned $72.00.

castortr0y [4]

Answer: 20%

Step-by-step explanation:

Rule of 3, let's put the money on the left and the percentage on the right of the chart.

$\frac{60.00}{72.00}=\frac{100}{x}$

$x=\frac{72*100}{60} \\x=120$

Calculate the difference.

$120-100=20$

5 0

3 years ago

Read 2 more answers

What is 17+6-6+6 divided by 6 + 17.

alina1380 [7]

Answer:

$\boxed{\bold{1}}$

Using Pedmas rule:

$\dashrightarrow \sf \dfrac{17+6-6+6}{6+17}$

<u>subtract: 6-6 = 0</u>

$\dashrightarrow \sf \dfrac{17+6}{23}$

<u>simplify the following</u>

$\dashrightarrow \sf \dfrac{23}{23}$

<u>the numerator and denominator cancels out</u>

$\dashrightarrow \sf 1$

4 0

2 years ago

Read 2 more answers

Distribution with a mean of 100 and standard deviation of 15...

anzhelika [568]

Use the z-score:
112 - 100
For 112, the z-score is --------------- = 12/15, or 0.8.
15

Next, find the AREA under the standard normal curve TO THE LEFT OF 0.8.

Use either a z-score table or a calculator for this purpose.

Using my calculator, I found that this area is 0.532. That places 112 in the 53rd percentile.

82 would be in a lower percentile: the 12th percentile.

Let me know if you have questions about how to use a calculator to do these calculations.

8 0

4 years ago

An airplane travels 550 miles from North Carolina to Tennessee in 90 minutes. At this rate, how many minutes will it take the ai

scZoUnD [109]

Answer:

It will take 1,080 min or 18 hours

Step-by-step explanation:

Here is why, since 6600 miles is 12 times farther than 550 miles you'd multiply the time it took to go 550 miles by 12 too

8 0

3 years ago

A screwdriver is 20 centimeters long, and a piece of wire is 10 millimeters long. The screwdriver is how many times as long as t

Novay_Z [31]

Answer: 20 times

Step-by-step explanation:

Given: The length of piece of wire = 10 millimeters

The length of screwdriver = 20 centimeters

We know that 1 cm = 10 mm

Therefore, the length of screwdriver = $20\times10=200$ millimeters

The ratio of the length of screwdriver and length of wire is given by :-

$\frac{\text{length of screwdriver}}{\text{length of piece of wire}}=\frac{200}{10}=20$

The screwdriver is 20 times as long as the wire.

8 0

3 years ago

Read 2 more answers