Answer:
a.
Step-by-step explanation:
All you have to do is distribute them
a.) -15x + 39
b.) -15x - 39
c.) 15x - 39
d.) 15 + 39
The one equivalent to -15x + 39 is A
Answer:
a
Step-by-step explanation:
i think its correct
Answer:
A, C, D
Step-by-step explanation:
Germany was losing WW1, even though they were the 3rd country to be in it. Russia was starting to conquer back lost land, the Ottoman Empire had fallen, Austria-Hungary had surrendered. The Germans were at a loss, so they had to surrender.
Answer:
Step-by-step explanation:
(7 - y)/(5 + 4) = 1/3
(7 - y)/9 = 1/3
21 - 3y = 9
-3y = -12
y = 4
Solution :
Given :
The height of the person is 5 foot.
The height of the lamppost is 12 foot.
Speed of the person away from the lamppost = 4 ft/s
Let the distance of the tip of the shadow of the perosn to the pole at t seconds after the person started walking away from the pole be d(t).
By similarity of the triangles, we see that
.................(i)
Here x is the distance from the person to the tip of the shadow. As it is given the speed of the person is 4 ft/s, then the distance of the person from the pole 4t. So we have,
x = d - 4t .............(ii)
Putting (ii) in (i) and solving for d is
d(t) = 6.85 t
So now if we derive d(t), we will get the wanted rate of the tip of the shadow.
∴ d'(t) = 6.85 ft/s