12 people liked neither.
30-11-7= 12
30: total class
11: people that like chocolate cake
7: people that like white cake
Estimating 495 would be 500 and estimating 254 would be 300. Then just add them and you'll get 800.
Answer:
n = 6 + or n = 6 -
Step-by-step explanation:
We can solve this equation using the quadratic formula OR Completing the Square method.
n² + 14 = 12n
rearrange : n² - 12n + 14 = 0
here a= 1 , b = -12, c = 14
the quadratic formula says: x = - b/ (2a) + root(b^2 - 4ac) / (2a)
or x = - b/ (2a) - root(b^2 - 4ac) / (2a)
x = - (-12)/ (2) + root((-12)^2 - 4*14) / (2)
x = 6 + root (144 - 56) / 2
x = 6 + root(88)/2
x = 6 + root(4*22) / 2
x = 6 + 2*root(22)/2
x = 6 + root(22) = 6 +
so x =6 + or x = 6 -
In this case x = n
n = 6 + or n = 6 -
When you are asked o find the
unit rate, you have to take note of the ratio the problem is given to you. In here,
you have 294 miles every 14 gallons. All you need to do is to divide it. 294/14
= 21 miles per gallon.