Y = x^2 +2x
y = 3x +20
so:
x^2 + 2x = 3x + 20
subtract 3x from both side:
x^2 +2x -3x = 20
combine like terms:
x^2 -x = 20
subtract 20 from each side:
x^2 -x -20 = 0
factor the polynomial:
(x-5) (x+4) = 0
solve for x
x = 5 and x = -4 ( 5-5 = 0 and -4 +4 = 0 )
replace x = 5 in 2nd equation: y = 3(5) +20
y = 15 +20
y = 35
replace x with -4 in same equation:
y = 3(-4) +20
y = -12 +20
y = 8
so solution is (5,35) and (-4,8)
Answer:
I dont know im so sorry
Step-by-step explanation:
<span>Alice
Correa bought three yards of cloth to make a dress
The cloth was on sale for 1.93 per yard.
Now, how much did Alice pay for the
cloth if the sales tax was 5%.
Let’ solve for the answer
=> 3 yard of clothes were both.
=> Price of clothes are 1.93 dollars per yard
=> then another sales tax is added which is 5%
=> 3 yards * 1.93 dollars = 5.79 dollars
=> 5.79 dollars * .05 = 0.2895
=> 5.79 + 0.2895
=> 6.08 dollars.
</span>
3 because u have to do 3 times 4 than add that one witch give you 13 over 4 so u have to divide 4 and 13 witch gives u 3
