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3 years ago

13

bill is in a class of 50 students.40% of the students in the class take the bus to school. How many students do not take the bus

to school.

1 answer:

deff fn [24]3 years ago

8 0

Answer:

30

Step-by-step explanation:

100%-40%=60%

but 50 is half of 100 you half 60% to 30 people

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I need help please!!!

svetoff [14.1K]

Answer:

D

Step-by-step explanation:

8 0

3 years ago

A box of nails weighs 130 pounds when it is 2/3 full. It weighs 74 pounds when it is 3/8 full. What is the weight of the box?

Mumz [18]

You take 130 divide by 2 to get 65 when its 1/3 full. Times 3 to 65 when its 3/3 full meaning full. 165 is your answer.

4 0

3 years ago

An Archaeologist in Turkey discovers a spear head that contains 79% of its original amount of C-14. Find the age of the spear he

agasfer [191]

Answer:

The age of the spear head is of 1938 yers.

Step-by-step explanation:

The amount of carbon 14 after years is given by the following equation:

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

In which Q(0) is the initial amount and r is the decay rate.

The half life of carbon 14 is 5700 years.

This means that $Q(5700) = 0.5Q(0)$

So

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

$0.5Q(0) = Q(0)e^{-5700r}$

$e^{-5700r} = 0.5$

$\ln{e^{-5700r}} = \ln{0.5}$

$-5700r = \ln{0.5}$

$5700r = -\ln{0.5}$

$r = -\frac{\ln{0.5}}{5700}$

$r = 0.00012160476$

So

$Q(t) = Q(0)e^{-0.00012160476t}$

We have to find:

t for which Q(t) = 0.79Q(0). So

$Q(t) = Q(0)e^{-0.00012160476t}$

$0.79Q(0) = Q(0)e^{-0.00012160476t}$

$e^{-0.00012160476t} = 0.79$

$\ln{e^{-0.00012160476t}} = \ln{0.79}$

$-0.00012160476t = \ln{0.79}$

$0.00012160476t = -\ln{0.79}$

$t = \frac{-\ln{0.79}}{0.00012160476}$

$t = 1938.43$

Rounding to the nearest year.

The age of the spear head is of 1938 yers.

8 0

2 years ago

What would be the answer?

netineya [11]

Answer:

A

Step-by-step explanation:

-b=d

since c=0

b and d have the same absolute value

6 0

3 years ago

Need help ASAP, pls an thank u

KATRIN_1 [288]

Answer:

C.)

Step-by-step explanation:

4 0

3 years ago