4 years ago

I DONT KNOW WHAT IM DOING PLS HELP ME

Mathematics

1 answer:

stepladder [879]4 years ago

7 0

Pretty sure it’s 35...

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How much of a radioactive kind of calcium will be left after 10 days if the half-life is 5 days

Sophie [7]

Answer: 16 g

Step-by-step explanation:

We can solve this with the Radioactive Half Life Formula:

$A=A_{o}.2^{\frac{-t}{h}}$

Where:

$A$ is the final amount of radioactive calcium

$A_{o}=64 g$ is the initial amount of radioactive calcium

$t=10 days$ is the time elapsed

$h=5 days$ is the half life of radioactive calcium

Solving with the given data:

$A=(64 g)2^{\frac{-10 days}{5 days}}$

$A=16 g$ This is the amount of radioactive calcium left

7 0

4 years ago

A certain drug treatment cures 90% of cases of hookworm in children.18 Suppose that 20 children suffer- ing from hookworm are to

Anni [7]

Answer:

Step-by-step explanation:

Here X the no of children suffering from hookworm treated and recovered is binomial because

a) Each child is independent of the other

b) There are only two outcomes

c) The probability for any child to recover is constant as 90% = 0.9

X is Bin (20,0.9)

a) Prob that all 20 will be cured

=P(X=20)= $0.9^{20} \\=0.1216$

b) Prob all but 1 will be cured= $P(x=1) = 20C1 (0.9) (.1)^{19} \\=1.8(10^8)$

c) Prob exactly 18 will be cured

$=P(X=18)\\=20C18 (0.9)^{18} (0.1)^2\\= 0.2852$

d) Prob exactly 90% will be cured.

= $P(X=18)\\=20C18 (0.9)^{18} (0.1)^2\\= 0.2852$

7 0

4 years ago

Shanay can swim the 100m race in 70.2seconds.Swapnil can swim the same in 70.06 seconds. Who is faster

ruslelena [56]

Swapnil is faster
70.06 < 70.2 s

4 0

3 years ago

Find the 79th term of the following arithmetic sequence. 5,11, 17, 23...

NikAS [45]

Answer:

the answer is 479.

Step-by-step explanation:

to make it simpler, pretend you start from 1. 1,7,so on. multiply six by 79, to get 474. but because you are starting from 5 and not 1, you have to add 5 on.

sorry im super bad at math so this might be wrong

4 0

3 years ago

Read 2 more answers

A bike shop is having a sale 40% off all bikes. If you see a bike for $280, how much will you pay after receiving the 40% discou

Maurinko [17]

The answer would be $112.
explanation:
40%——> .40
280 x .40 = 112

6 0

3 years ago