Answer:
23.2%
Step-by-step explanation:
First we need to find how many half lives 135 years is:
135 ÷ 64 = 2.109375
Now we divide 100% by 2 to the power of the number of half lives. This is how you calculate the percentage of the original amount left. If you have the original mass, you can substitute that in instead of 100%:
100 ÷ 
= 23.1747390635
To 1 decimal place it is 23.2%
Answer: 
<u>Step-by-step explanation:</u>
0° < A < 180° so it is in Quadrant I or II
since tan A is negative, it is in Quadrant II ---> (-x, +y)
Next, find the hypotenuse given that x = -13 and y = 9
(-13)² + (9)² = r²
250 = r²
5√10 = r
Answer:
1 4/7
Find a number that will divide evenly into both the top number and the bottom number. (You can do any math operation to either number as long as you do the same to the bottom number.)
Keep doing that until you can't find a number that works.
In this case try 5.
55 ÷ 5 = 11 and 35 ÷ 5 = 7
so: 55/35 = 11/7
since the top number is greater than the bottom, reduce 11/7 to 1 4/7
Answer:
with wat there is no pitcure
Step-by-step explanation:
Answer:
87cm
Step-by-step explanation:
5*10=50
3*10=30
2.5*6=15-(5+3)=7
50+30+7=87cm
