Answer:
Step-by-step explanation:
For the first question: You need to multiply 20 by 0.05 to find the sales tax amount in dollars, which gives you $1. The sales tax is equal to $1.
For the second question: To find the total cost, add $1 to $20 to get $21 as the total cost for the shirt.
To factor quadratic equations of the form ax^2+bx+c=y, you must find two values, j and k, which satisfy two conditions.
jk=ac and j+k=b
The you replace the single linear term bx with jx and kx. Finally then you factor the first pair of terms and the second pair of terms. In this problem...
2k^2-5k-18=0
2k^2+4k-9k-18=0
2k(k+2)-9(k+2)=0
(2k-9)(k+2)=0
so k=-2 and 9/2
k=(-2, 4.5)
Is there supposed to be a graph or another picture? I do not see anything.
