Answer:
25%
Step-by-step explanation:
To solve this, we can use the percent change formula shown in the picture attached below. 
is the new value, 
is the old value, and 
represents the change. For this problem, 80 is the new value and 64 is the old value. Let's plug those numbers into the formula and solve for the percent change:
× 
×
×
Thus, the answer is 25%.
An integer that would work is 14 so -3 + 14 = -11
Answer:
There are 80 marks in total.
Step-by-step explanation:
Let the number of total marks be 
.
The percentage score of the student can be written as the ratio
.
However,
.
Equating the two:
.
Cross-multiply (that is: multiple both sides by 
, the product of the two denominators) to get
.
.
In other words, there are 80 marks in total.
Answer:
$1,075
Step-by-step explanation:
Use the formula I=PRT where I= interest, P=principle or starting amount, R=interest rate, T=time
1000*0.025*3=75
Add 75 to 1,000, 1,000+75=1,075
The product of two radicals is equal to the radicand. The square root deletes itself.
So the result is y^3
