Answer:
?= 3
Step-by-step explanation:
let x = ?
18-2x=4x
6x=18x
x=3
Distributive property or
use FOIL (FOIL is just an acronym to help you remember how to multiply binomials)
distributive property
a(b+c)=ab+ac
(b+c)a=ba+ca
distribute
(-3s+2t)(4s-t)=
(-3s+2t)(4s)+(-3s+2t)(-t)=
(-3s)(4s)+(2t)(4s)+(-3s)(-t)+(2t)(-t)=
-12s^2+8st+3st-2t^2=
-12s^2-2t^2+11st
if you want foil
FOIL (just tells wich terms to multiply)
First
Outer
Inner
Last
exmaple
with
(a+b)(c+d)
First: a times c
Outer: a times d
Inner: b times c
Last: b times d
then add them
(-3s+2t)(4s-t)
First: -3s times 4s=-12s^2
Inner: 2t times 4s=8st
Outer: -3s times -t=3st
Last: 2t times -t=-2t^2
add them
-12s^2+8st+3st-2t^2=
-12s^2+11st-2t^2
same
Answer:
3.2
Step-by-step explanation:
The distance of 2.7 and 3.7 to 3.2 is .5 each, thus it is the integer in between both numbers.
Answer:
The answer for the question is D. 1/x^8
Answer:
Bill drove 210 miles on the interstate.
Step-by-step explanation:
The total distance of his travel was 225 miles and there were two types of road in the course, the town roads at which he drove "x" miles and the interestate road at which he drove "y" miles. Therefore:
x + y = 225
On the town he drove at 30 mph on average and on the interestate he drove at 70 mph on average. Therefore:
x/30 + y/70 = 3.5
We can now build a system of equations shown below:
x + y = 225
x/30 + y/70 = 3.5
Multiplying second equation by -30, we have:
x + y = 225
-x - (3/7)*y = -105
(4/7)*y = 120
y = 120*(7/4) = 210
x + 210 = 225
x = 225 - 210 = 15
Bill drove 210 miles on the interstate.