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Makovka662 [10]
3 years ago
10

Walt's haircut costs $32. He leaves a 15% tip. How much does he pay for the haircut, including the tip?

Mathematics
2 answers:
Genrish500 [490]3 years ago
8 0

Answer:

Walt pays $47

Step-by-step explanation:

If Walt pays $32 for his haircut, and 15% is his tip,

We know here that in percentages, 15% = 15/100, which equals $15

Then, you would simply do 32 + 15

32 + 15 = 47.

Walt pays $47 for his haircut

hope this helps! <3

riadik2000 [5.3K]3 years ago
7 0

Answer: 36.8

Step-by-step explanation:

32 x 115 / 100 or you can find the 15% of 32 which is 4.8 and add it to 32 you get 36.8

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The half life of silicone-32 is 710 years. If 30 grams is present now, how much will be present in 300 years?
Irina18 [472]

Answer:

22.38 g of silicone-32 will be present in 300 years.

Step-by-step explanation:

A radioactive half-life refers to the amount of time it takes for half of the original isotope to decay and its given by

                                           N(t)=N_0(\frac{1}{2})^{\frac{t}{t_{1/2}}

where,

N(t) = quantity of the substance remaining

N_0 = initial quantity of the substance

t = time elapsed

t_{1/2} = half life of the substance

From the information given we know:

  • The initial quantity of silicone-32 is 30 g.
  • The time elapsed is 300 years.
  • The half life of silicone-32 is 710 years.

So, to find the quantity of silicone-32 remaining we apply the above equation

N(t)=30\left(\frac{1}{2}\right)^{\frac{300}{710}}=30\left(\frac{1}{2}\right)^{\frac{30}{71}}\approx22.38 \:g

22.38 g of silicone-32 will be present in 300 years.

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