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2 years ago

there are 24 students at the class picnic if 3/4 of the class is at the picnic how many students are in the class

Mathematics

1 answer:

Lady_Fox [76]2 years ago

6 0

Answer:

Step-by-step explanation:

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Jimmy wants to order pizza for the birthday party on Thursday each pizza has four slices if the eight kids at the party each eat

blagie [28]

Answer: 14 Pizzas

2 pizzas means each kid gets one

so 7 times 2 is 14 so I beleive the answer is 14

8 0

2 years ago

Element X decays radioactively with a half life of 12 minutes. If there are 200 grams of Element X, how long, to the nearest ten

Semenov [28]

Answer:

It would take 24 minutes for the element to decay to 50 grams

Step-by-step explanation:

The equation for the amount of the element present, after t minutes, is:

$Q(t) = Q(0)e^{-rt}$

In which Q(X) decays radioactively with a half life of 12 minutes.(0) is the initial amount and r is the rate it decreases.

Half life of 12 minutes

This means that $Q(12) = 0.5Q(0)$

$Q(t) = Q(0)e^{-rt}$

$0.5Q(0) = Q(0)e^{-12r}$

$e^{-12r} = 0.5$

$\ln{e^{-12r}} = \ln{0.5}$

$-12r = \ln{0.5}$

$12r = -\ln{0.5}$

$r = -\frac{\ln{0.5}}{12}$

$r = 0.05776$

If there are 200 grams of Element X, how long, to the nearest tenth of a minute, would it take the element to decay to 50 grams?

This is t when Q(t) = 50. Q(0) = 200.

$Q(t) = Q(0)e^{-rt}$

$50 = 200e^{-0.05776t}$

$e^{-0.05776t} = 0.25$

$\ln{e^{-0.05776t}} = \ln{0.25}$

$-0.05776t = \ln{0.25}$

$0.05776t = -\ln{0.25}$

$t = -\frac{\ln{0.25}}{0.05776}$

$t = 24$

It would take 24 minutes for the element to decay to 50 grams

6 0

3 years ago

A plane traveled 360 miles each way to Athens and back. The trip there was with the wind. It took 3 hours. The trip back was int

defon

Answer:

S=32.5

W=97.5

Step-by-step explanation:

S=speed of plane in still air

W=speed of wind

-----------------------------------------

3(S+W)=130

6(S-W)=130

-----------------------------------------

S+W=43.33333...

S-W=21.66666...

2S=64.999...

S=32.5(simplified)

-----------------------------------------

32.5+W=130

W=97.5

-----------------------------------------

5 0

3 years ago

Please help me and explain why it’s the answer

babymother [125]

Answer:

The answer is 1x+13.

Step-by-step explanation:

The reason for this is that if you put in the numbers for x you get y.

1(0)+13=13

1(1)+13=14

1(2)+13=15

1(3)+13=16

5 0

2 years ago

Read 2 more answers

What is the height of a triangle with area 40 square inches and base 20 inches?

Andru [333]

A=1/2 bh
40=1/2•20h
80=20h
4=h

3 0

2 years ago