Answer:
Step-by-step explanation:
Answer:
Step-by-step explanation:
e = earrings and b = bracelets
so each earring cost 5 bucks.....5e
and each bracelet cost 7 bucks.....7b
and she hopes to make $ 300...
so ur equation is : 5e + 7b = 300 <===
C doesn’t belong because it has rounded edges. all the other options have vertices
Answer:94%
Step-by-step explanation:
Half life of a radioactive element is the time taken for half it's mass to disintegrate away.it means after attaining half life,what will be left is 100-50=50%.
Let the 100% mass of C-14,be x
Then 5730years=1/2 of X
Then 660 years=y of X
Where Y is the fraction of C-14 that has disintegrate as at 1988.
5730/660=1/2X/yX
5730/660=1/2/y
Cross multiplying
5730×y=660×1/2
5730y=330
Y=330/5730=0.05759
In %,5.76%
Amount of C-14 left is
100-5.76=94.24=94% as at 1988.
