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Svetllana [295]
3 years ago
11

The half life of a radioactive kind of cadmium is 14 years. How much will be left after 28 years, if you start with 72 grams of

it?

Mathematics
1 answer:
nlexa [21]3 years ago
8 0

Answer:

18 grams

Step-by-step explanation:

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15% of $3.50 useing proportion
Otrada [13]

Answer:

0.525

Step-by-step explanation:

\frac{x}{3.50}=\frac{15}{100}

3 0
3 years ago
Read 2 more answers
The ratio of red marbles to blue marbles in a bag is 3:4 . If there are 42 marbles in the bag. how many marbles are red?
PolarNik [594]

Answer:

18 marbles

Step-by-step explanation:

Step 1

Express the fraction of each type of marble as a function of the total number of marbles as shown;

Let;

total marbles=x

red marbles=3/(3+4)=3/7x

blue marbles=4/7 x

But x=42 marbles

The total number of marbles for each type can be expressed as;

total number of red marbles=fraction of red marbles×total number of marbles

where;

fraction of red marbles=3/7 x

total number of marbles=42

replacing;

total number of red marbles=(3/7)×42=18 marbles

total number of blue marbles=fraction of blue marbles×total number of marbles

where;

fraction of blue marbles=4/7 x

total number of marbles=42

replacing;

total number of blue marbles=(4/7)×42=24 marbles

5 0
2 years ago
A local newspaper did a survey asking people of different ages how many hours they spend using social media sites each week. The
FrozenT [24]

Answer:

Step-by-step explanation:

5 0
2 years ago
What is the radius of the cone?
gayaneshka [121]

Answer:

r = 6 in

Step-by-step explanation:

V = \pi r^{2} \frac{h}{3} = 216\pi

r²h/3 = 216

r² (18/3) = 6 r² = 216

r² = 216/6 = 36

r = 6

3 0
2 years ago
A circular plate has circumference of 26.4 inches. What is the area of this​ plate? Use 3.14 for pi.
mafiozo [28]
I believe the answer is 55.49 inches
using the equation C^2/(4*3.14)
3 0
2 years ago
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