Final answer:
To find an expression equal to 3C+D in standard form, substitute the given expressions into the equation and simplify.
Step-by-step explanation:
To find an expression that equals 3C+D in standard form, we need to substitute the given expressions for C and D into the expression 3C+D. We can then simplify the expression to get it in standard form.
Given: C = 2y-1 and D = y-y^2
Substituting these values into the expression 3C+D:
3C+D = 3(2y-1) + (y-y^2)
Simplifying:
3C+D = 6y-3 + y-y^2
Combining like terms:
3C+D = -y^2+7y-3
Therefore, the expression that equals 3C+D in standard form is -y^2+7y-3.