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lions [1.4K]
2 years ago
9

(5) I already know the answer but I'm pretty sure you guys would like some points so just trying to figure it out

Mathematics
1 answer:
Andrews [41]2 years ago
3 0

Answer:

I'm going to imagine the answer is math

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Quanto é: xa + xb + ta + tb? Por Favor ALGUÉM ME AJUDA preciso muito!
lesantik [10]
Seja E a expressão que queremos calcular:

E=xa+xb+ta+tb\\\\
E=x(a+b)+t(a+b)\\\\
\boxed{E=(x+t)(a+b)}
8 0
3 years ago
Rewrite 1/100,000,000 as a power of 10
yarga [219]
1/100,000,000 , note that 100,000,000 = 10⁸ , then:

1/100,000,000  = 1/10⁸
Remember that 1/aⁿ  = a⁻ⁿ

Hence 1/100,000,000 = 1/10⁸ = 10⁻⁸

3 0
2 years ago
Read 2 more answers
The radioactive isotope radium has a half-life of 1,600 years. The mass of a 100-gram sample of radium will be______ grams after
Olenka [21]
To solve this we are going to use the half life equation N(t)=N_{0} e^{( \frac{-0.693t}{t _{1/2} }) }
Where:
N_{0} is the initial sample
t is the time in years
t_{1/2} is the half life of the substance
N(t) is the remainder quantity after t years 

From the problem we know that:
N_{0} =100
t=200
t_{1/2} =1600

Lets replace those values in our equation to find N(t):
N(200) =100e^{( \frac{(-0.693)(200)}{1600}) }
N(200)=100e^{( \frac{-138.6}{1600} )}
N(200)=100e^{-0.086625}
N(200)=91.7

We can conclude that after 1600 years of radioactive decay, the mass of the 100-gram sample will be 91.7 grams.

8 0
3 years ago
Explain how you would round the numbers 33 and 89 to estmate their sum
ValentinkaMS [17]
Well 33 is rounded down to 30

And 89 is rounded up to 90

So it would be 120

Anything from 1-4 is rounded down and anything 5-9 is rounded up
8 0
3 years ago
Read 2 more answers
Joshua went kayaking. It cost him $ 15 to rent the kayak. It also cost $ 6 for each hour spent on the lake kayaking. Joshua spen
pishuonlain [190]

Step-by-step explanation:

The total bill will be the sum of the rent and the cost for the total time spent.

$15 + $6 * 2.5

$15 + $15

$30

8 0
2 years ago
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