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Otrada [13]
3 years ago
5

What is the product of -15 and -3? A.5 B.-5 C.-18 D.45

Mathematics
1 answer:
Anastaziya [24]3 years ago
7 0
The product of -15 and -3 is d
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You have just isolated a new radioactive element. If you can determine its half-life, you will win the Nobel Prize in physics. Y
Troyanec [42]
Staals half
1 gram left
0.3 grams left
half lives are normally written in years
it goes likt this

A=P( \frac{1}{2})^ \frac{t}{h}
A=final amount
P=initila amount
t=time elapsed
h=time half life is (same units as time)

let's use days as the units of time


we are given
initial amount=1gram
final amount=0.3gram
time=4 days

so
0.3=1( \frac{1}{2})^ \frac{4}{h}
solve for h
0.3=( \frac{1}{2})^ \frac{4}{h}
take the ln of both sides
ln(0.3)=ln( \frac{1}{2})^ \frac{4}{h}
ln(0.3)=\frac{4}{h}ln( \frac{1}{2})
times both sides by h
hln(0.3)=4ln( \frac{1}{2})
divide both sides by ln(0.3)
h= \frac{4ln( \frac{1}{2}) }{ln(0.3)}
use calculator
h=2.30287
3 sig figs
h=2.303 days
6 0
3 years ago
A rectangle measures 15 2 inches by 4 3 inches. What is its area?
IRINA_888 [86]

Answer:

65.36

Step-by-step explanation:

15.2 x 4.3 = 65.36

4 0
2 years ago
4.5+16.02 work and answer
lbvjy [14]

Answer: 20.52

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
PLSSS CAN SOMEONE HELP MEE, my friend can't figure this out , and the assignment is already overdue , pls someone help :(
amid [387]

Answer:

um 1630 divided by 96 and divided by 3equals the answer ? yes yes i think

Step-by-step explanation:

5 0
3 years ago
Solve the equation x/3 -5 =y for x.
bagirrra123 [75]
A. X=3y + 15
I took the test last year
6 0
3 years ago
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