Answer:
The above equation is a quadratic function whose zeroes are 3 and 12.
Step-by-step explanation:
The general quadratic equation is given by :

It is given that, the zeroes of a quadratic function are 3 and 12. It means they must be factors of it such that,

So, we can write as :

Multiplying both factors,

So, the above equation is a quadratic function whose zeroes are 3 and 12.
A. 8/$12=21/$x then cross multiply. B. 1/$1.5
20%
Because Suppose x% of 20 is 4
That is
x100×20=4
or
x5=4
—> =4×5=20
So 20% of 20 is 4

Hello!
To solve this, find the cost of a single light bulb first, by dividing 9 / 5.
9 / 5 ==> 1.80
One light bulb is $1.80
Now, multiply 1.80 by 7.
1.80 * 7 = 12.6
7 light bulbs cost $12.6
Hope this helps! ☺♥