-2x^2-4x=0
you just move the -5 to the right and get 5 and you cant subtract 4x from -2x^2
7229 feet = 1.369129 miles
561 seconds =0.155833 hours
She can run 1.369129 miles per 0.155833 hours
This is the concept of quadratic equations, solving the equation 2x^2-12x+20=0 using the formula we get:
x=[-b+/-sqrt(b^2-4ac)]/(2a)
from our equation, a=2,b=-12 and c=20
x=[-(-12+/-sqrt((-12)^2-4*2*20)]/(2*2)
x=[12+/-sqrt(144-160]/4
x=[12+/-sqrt(-16)]/4
x=[12+/-4i]/4
x=[3+\-i]
the answer is A] 3+/-i
$12.75 divided by 15 pens = $0.85 per pen
$17.40 divided by 20 pens = $0.87 per pen
the first store has the lower price for pens. when you calculate the price of one singular pen, the first store sells them for $0.85 however the second store sells them for $0.02 more ($0.87)
