Answer:
x-y=4
Step-by-step explanation:
(y+4)/(1+4) = x/5
(y+4)/5 = x/5
y+4 = x
-x+y= -4
x-y = 4
Answer:
75
Step-by-step explanation:
Scores for his first tests were 65, 67, 69.
Rate of change: +2
y=2x+63; 63 is the 0th test he took, his first test was 65, so 65-2=63. 2x is the rate of change, his tests scores increase by 2 each time.
x=6, 6th test score
y=2(6)+63
y=12+63
y=75
So, on his 6th test he will get a score of 75
Answer:
5 gallons would be left in the tank after 4 hours.
Step-by-step explanation:
(how much is t hours)
1. Move all terms to one side
2x^2+3x+1=0
2. Find the numbers for a, b and c
a=2
b=3
c=1
3. Put the numbers into the formula
3^2-4(2)(1)
4. Simplify
9-4*2*1
9-8
1
