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uranmaximum [27]
3 years ago
12

A Scientist has 1200 grams of radioactive substance. Every day, half of the substance decays and only half remains.on which day

will the scientist have less than one gram of the substance left ? There will be less than one gram on day ________
Mathematics
1 answer:
Vladimir [108]3 years ago
6 0

Step-by-step explanation:

Day 1: 1200g / 2¹ = 600g

Day 2: 1200g / 2² = 300g

Day 3: 1200g / 2³ = 150g

The pattern is the amount of radioactive substance on day n is 1200 / (2^n).

Therefore, we have to find n where 2^n > 1200.

The first such n is 11 (2¹¹ = 2048).

Hence, there will be less than 1 gram on day 11.

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If a1=10 and an=an-1+4 then find the value of a5
tamaranim1 [39]

Answer:

26

Step-by-step explanation:

Each term is the previous with 4 added to it.

a1 = 10, a2 = 14, a3 = 18, a4 = 22, a5 = 26

3 0
3 years ago
22 students is__% of 55<br> Pls show me in steps
kramer

Answer:

40%

Step-by-step explanation:

divide the students by the total

22/55 = P

P = 0.4 = 40%

8 0
4 years ago
Help me please. I dont understand this question.
ziro4ka [17]

Answer:

y = 100°

Step-by-step explanation:

I can't see the full question, but I'm guessing you need to find the measure of angle y.

The total angle sum of a polygon can be calculated with the formula

T = 180°(n - 2)   where T is the total angle measure, and n i the number of sides.

For our shape, there are 4 sides, so n = 4.  Plug that in and simplify...

T = 180°(4 - 2)

  T = 180°(2)

      T = 360°

We are given 3 of the angles, so angle y is

y = 360 - 107 - 104 - 49

    y = 100°

5 0
3 years ago
A sauna has an initial temperature of 80° If the opening to the sauna is left open, and the temperature therefore decreases by 3
ddd [48]

Answer:

71.6°

Step-by-step explanation:

=210s÷60s(1 minutes)

=3.5mins

=3.5mins×3%(=1min)

=10.5%

=100%-10.5%

=89.5%

=89.5%/100×80°

=71.6°

Hope this will help ya!

5 0
3 years ago
Solve for r in the scientific formula d = rt.<br><br> r = _______
marta [7]
R = d/t is the answer. Hope this helped
4 0
3 years ago
Read 2 more answers
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