Answer:
1st option: when a sperm joins an egg
Step-by-step explanation:
A sperm will be accepted into the egg, and fertalize it
Answer:
(b + 3) + 6 = <u>b + 9</u>
Explanation:
The order in which you add numbers together doesn't matter.
146.74 because 42% of 253 is 106.26, and take that away from 253 = 146.74
Answer:
The answer is 80%.
Step-by-step explanation:
During a certain day, a worker made 81 parts.
He usually does 45 parts per day.
Number of extra parts made = 
The percent by which he increased the number of parts he usually makes can be given as =
= 80%
Therefore, on that day, the percent increased by 80%.