This is a linear equation, and it is solved for finding the value of x.
2x - 5 = -20
now simple number -5 goes to the other side of equation and turns into +5, then the equation becomes
2x = -20 +5
now we get 2x = -15
because -20 + 5 = -15, greater number is 20 then 5 and 20 is with - sign.
the next step is x = -15/2
in 2x, 2 is multiplying with x when it goes to the other side of equation 2 will be divided with -15, that's why we get
x = -15/2
which is the value of x
The end of its travel is when S(t)=0 or when it has hit the ground...
-16t^2+25=0 divide equation by -1
16t^2-25, this is a difference of squares which always factors:
(a^2+b^2)=(a+b)(a-b), in this case:
(4t+5)(4t-5)=0, since t>0
t=5/4=1.25, and since it started falling at t=0, its time moving in the air is:
1.25-0=1.25 seconds.
Answer:
If 1/4 of the gas tank is filled, then there are 5 gallons currently in the gas tank.
If 10 gallons are added to the gas tank, there will be 15 gallons in the gas tank, meaning that the gas tank will be 3/4 full.
Let me know if this helps!
AD is 12 (in a paralellogram opposite sides are equal)
