The answer for is a) x=12
$3.50 being the amount the item <em>t</em> costs and <em>t</em> being the number of this item.
Answer:
Step-by-step explanation:
3/4 and 2/5 have a common denominator which is twenty so you can rewrite the equation with just knowing that
You can then multiply both sides by twenty to solve this equation.
Hope this helps.
The answer is x = 10/3. You just have to add 21 to both sides of this equation then simplify. Hope this helped!
First you open 2 parenthesis with x in each one:
(x )(x )=0
Then, you place the sign of the second term (the x term) in the first parenthesis.
(x+ )(x )=0
Next, you multiply the signs of the x term and the sign of the constant (the third term).
Since + × - = -, then you place a -.
(x+ )(x- )=0
You look at the constant (-18) and the second term (3). What two numbers multiplied give you -18 but subtracted (since the signs inside the parenthesis are opposite) give you 3? Those numbers are 6 and 3.
Since the result of the substraction need to be 3, you place the 6 with the + sign and the 3 with the negative sign (if you think of it, 6-3=3 but 3-6 = -3. That's the reason behind placing the numbers)
(x+6)(x-3)=0
Therefore,
x+6=0 or x-3=0
x=-6 or x=3
Your roots are -6 and 3.
