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2 years ago

What is the answer to 6+5(9 divided by 3)2

Mathematics

2 answers:

Wittaler [7]2 years ago

7 0

6+5(9/3)2
6+5(3)2
6+5+6
11+6
17

Lubov Fominskaja [6]2 years ago

4 0

Answer:

i think its 16 if not im sorry but i hope this helped you have good day

Step-by-step explanation:

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After the release of radioactive material into the atmosphere from a nuclear power plant in a country in 1984, the hay in that

AlexFokin [52]

Answer:

23 days.

Step-by-step explanation:

Let the original amount of radioactive material be 100.

We have been given that the half life of a radioactive material is 8 days. It is safe to feed the hay to cows when 14% of the radioactive isotope remains. We are asked to find the number of days, the farmers need to wait to use the radioactive contaminated hay.

We will use half-life formula to solve our given problem.

$A=a\cdot (\frac{1}{2})^{\frac{t}{h}}$ , where,

A = Amount left after t time,

a = Initial amount,

h = Half-life.

14% of 100 would be 14.

$14=100\cdot (\frac{1}{2})^{\frac{t}{8}}$

$\frac{14}{100}=\frac{100\cdot (0.5)^{\frac{t}{8}}}{100}$

$0.14=(0.5)^{\frac{t}{8}}$

Now, we will take natural log of both sides.

$\text{ln}(0.14)=\text{ln}((0.5)^{\frac{t}{8}})$

Using natural log property $\text{ln}(a^b)=b\cdot \text{ln}(a)$ , we will get:

$\text{ln}(0.14)=\frac{t}{8}\times \text{ln}(0.5)$

$\text{ln}(0.14)=\frac{t\times \text{ln}(0.5)}{8}$

$\frac{\text{ln}(0.14)}{\text{ln}(0.5)}=\frac{t\times \text{ln}(0.5)}{8\times \text{ln}(0.5)}$

$\frac{-1.966112856}{-0.69314718055}=\frac{t}{8}$

$2.836501267=\frac{t}{8}$

$\frac{t}{8}=2.836501267$

$\frac{t}{8}*8=2.836501267*8$

$t=22.6920101377$

$t\approx 23$

Therefore, the farmers need to wait for 23 days.

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3 years ago

Ivan has 6 times as many blue beads as red beads .He has 49 red and blue beads in all. How many blue beads does Ivan have?

lutik1710 [3]

294 should be the answer

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3 years ago

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4.7×2.65 4.7 times 2.65

kramer

Answer:

The answer to 4.7 times 2.65 equals 12.455

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3 years ago

6(3n+1)-3(-1+2n)=n+2

kap26 [50]

First, you want to distribute the 6 and the -3. This turns you equation into 18n+6+3-6n=n+2. Next, put all the n's on one side and numbers on the other. 18n-6n-n=2-6-3. Then, combine. 11n=-7 -> n=-7/11. Hope this helps!

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3 years ago

Evaluate the expression

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