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patriot [66]
4 years ago
12

Marvin's Tree Service purchased several spruce tree saplings.

Mathematics
1 answer:
77julia77 [94]4 years ago
5 0

Answer:

I think it’s d

Step-by-step explanation:

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Element X decays radioactively with a half life of 13 minutes. If there are 110 grams of Element X, how long, to the nearest ten
Vaselesa [24]

Answer : The time taken by the element to decay to 2 grams is, 75.2 minutes

Step-by-step explanation:

Half-life = 13 min

First we have to calculate the rate constant, we use the formula :

k=\frac{0.693}{t_{1/2}}

k=\frac{0.693}{13\text{ min}}

k=0.0533\text{ min}^{-1}

Now we have to calculate the time passed.

Expression for rate law for first order kinetics is given by:

t=\frac{2.303}{k}\log\frac{a}{a-x}

where,

k = rate constant  = 0.0533\text{ min}^{-1}

t = time passed by the sample  = ?

a = initial amount of the reactant  = 110 g

a - x = amount left after decay process =  2 g

Now put all the given values in above equation, we get

t=\frac{2.303}{0.0533}\log\frac{110}{2}

t=75.2\text{ min}

Therefore, the time taken by the element to decay to 2 grams is, 75.2 minutes

7 0
4 years ago
1. Gloria says the two expressions 2(3x+6) - 9x and 3x4 are equivalent,
scZoUnD [109]

Step-by-step explanation:

Well, Let's find out!

Gloria says,

2(3x+6)-9x=3*4

By using distributive law

6x+12-9x=12

12-3x=12

-3x=12-12

-3x=0

x=0/-3

So she is not correct

5 0
3 years ago
Read 2 more answers
Denzel does not want to lock up his money in Investments that have a long maturity period, nor does he like to take big risks. S
Jet001 [13]

Answer:Its D, just took the test.

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
Mary has 30 nickels and dimes worth $2.40. how many nickels does Mary have
Troyanec [42]
N=nickels
d=dimes

n+d = 30
n+18 = 30
n = 30-18
n = 12 (number of nickels)

therefore Mary has 12 nickels
5 0
3 years ago
Read 2 more answers
Barbara works in a bakery. She puts 12 blueberries in each blueberry muffin she makes. How many blueberries does Barbara need to
Elena-2011 [213]

Answer:

96 blueberries

Step-by-step explanation:

x = number of muffins

Since each blueberry is going to contain 12 blueberries, we can multiply 12 by the number of muffins to get the total number of blueberries.

12x

12(8)

96

4 0
4 years ago
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