Her change will be $16.22 since 20 +20 is 40 and 40 - 23.78 is 16.22
For this you would do

Because 60% is the same as 0.60. And solving a problem like this is the opposite of finding a percent of a number. When you solve this you get 80. So there are 80 students in total.
The greatest common factor of two numbers, one of which is 1, will always be 1.
Answer: (x+1)(x+2)
step by step explanation:
A
x=75°
B
We know that ∠EFG=∠ABF because they are corresponding angles.
We also know that ∠x+∠ABF=180, because angles along a straight line always equal 180:
x+105=180
x=75°