Answer:
Factor by grouping. (3r + 5)(r-3)
Step-by-step explanation:
Answer:
Step-by-step explanation:
xy = 300
x + y = 50 Solve for y
y = 50 - x substitute into xy = 300
x(50 - x) = 300 Remove the brackets.
50x - x^2 = 300 Bring the left to the right.
0 = x^2 - 50x + 300
This is a quadratic. It will have 2 solutions.
a=1
b = - 50
c = 300
Put these into the quadratic equation.
It turns out that x has two values -- both plus
x1 = 42.03
x2 = 6.97
x1 + y1 = 50
42.03 + y = 50
y = 50 - 42.03
y = 7,97
(42.03 , 7.97)
====================
x2 + y2 = 50
6.97 + y2 = 50
y2 = 50 - 6.97
y2 = 43.03
(6.97 , 43.03)
Answer:
1 and 3
speed with direction is called velocity
624 divided by 10 gives you 62.4(miles per hour) 660 divided by 12 gives you 55(miles per hour). So Nancy’s rate was 62.4 miles per hour & Rebecca’s rate was 55 miles per hour. That would be 62.4/55
sorry i had the wrong answer...
