Answer:
12
Step-by-step explanation:
this equation can be derived from the question
55 - 4x < 10
< = less than
x = number of days
solve for x
55 - 10 < 4x
45 < 4x
x < 11.25
at the 11th day, there would be 11 keys left
on the 12th day, there would be 7 keys left
the correct answer is 12 days
(7.5-3.5)/(4.5-2.5)= 4/2= 2
y - 7.5 = 2(x - 4.5): the answer
To complete: y - 7.5 = 2x - 9
y = 2x - 1.5
Answer:
you can add 3x and 2x
Step-by-step explanation:
you can add them because they are both like terms
5/8 = x/72 where x is the perimeter of the smaller rectangle.
8x = 5 * 72
x = 5 * 9
x = 45