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:
2,5 then 17 20 then keep adding 15 for x and y
-15+2 means you add 2 to the negative number 15 so -15+2 will give us -13 which is the answer.
Answer:
45
Step-by-step explanation:
Let the unit place be ‘x'
Tenth place be y
The number is 10y+x
x+y = 9 (according to the condition) (1)
Digits are interchanged Unit place' y ‘& tenth place ‘ x'
New no is 10x +y
This is 9 more than the original number
10x+ y = 10y+x +9
10x-x+y-10y = 9
9x-9y= 9
x-y = 1 (dividing by 9) (2)
Adding the two equations
2x = 10
x= 5
Substituting the value of x in first equation
y = 4
The number is 45, the original number is 54 this is 9 more of the new number.
71,290 because the 0 can't make 90 go up.
