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forsale [732]
3 years ago
5

I need help I’m in my class right now plz help me

Mathematics
1 answer:
Maru [420]3 years ago
3 0

Answer:

minus 7a plus 11

Step-by-step explanation:

nfiedneifnejd

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Question 5: How long will it take for 2 g of a sample of iodine-131, which has a half-life of about 8 days, to decay to 0.04 g?
Aleonysh [2.5K]

This problem can be represented through the following equation

A = A₀(1/2)^t/h

where

A----------->  is the amount of substance left after time t

A₀ ----------> is the original amount---------> 2 g

h------------->  is the half-life-----------> 8 days

for A=0.04 g

t=?

0.04 = 2(1/2)^t/8

0.02 = (1/2)^t/8

Take ln on both sides:

ln(0.02) = ln [(1/2)^t/8]

ln(0.02) = (t/8)(ln 1/2)

t = 8*ln(0.02)/ln(1/2)

t = 45.15 days

the answer is 45.15 days

4 0
3 years ago
A rectangle is formed by two congruent right triangles. The area of each triangle is 6 in2. If each side of the rectangle is a w
viktelen [127]
Area of the rectangle is 2*6=12 in^2
12 could be = 1*12  or 2*6   or 3*4 
P could be 2*(1+12)=2*13=26 
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the answer is 24 in  (c)
4 0
3 years ago
Please help me on this one.
EleoNora [17]
3(j+4)-9=9
3j + 12 -9 =9
3j +3 =9
3j =6
j=2
7 0
3 years ago
Read 2 more answers
Vincent flipped three coins during a probability experiment. The outcomes of the first 40 trials are shown in the table
mafiozo [28]

Answer:

Step-by-step explanation:

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3 years ago
4x - 20 =-44 I need the answer ASAP
Trava [24]

Answer:

x=8

Step-by-step explanation:

44-20=24

24/4=8

3 0
3 years ago
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