Xavier and Yifei have been married for exactly 10 years.
Yifei is seven years older than Xavier.
sum of their ages is 67.
How old was Yifei when they were married?
a. Write an equation that represents the unknown ages in terms of
age when they were married.
(Y =Yifei's age when married, X = Xavier's age when married)
Y = x+7
X = y-7
(y+10)+(y-7+10) = 67
Y+10 + Y+3
b. Determine how old Yifei was when Yifei and Xavier were married. (Solve your equation(s) for Y)
27 Years old.
5. The cost of cleaning up pollution in a stream is given by
is the cost in dollars to
percent of the stream.
(For instance, when
is 20, then the formula will calculate the cost to clean up 20
percent of the stream.)
must be greater than or equal to zero and
must be less than what number?
P must be greater than zero because there is always going to be pollution to clean up, and an unreleastic
number would be zero because there is no chance.