Answer:
Step-by-step explanation:
Let +s+ = the speed of the passenger train
+s+-+20%5D+ = the speed of the freight train
Let +t+ = time in hours for both trains
-------------------------------------
Equation forpassenger train:
(1) +280+=+s%2At+
Equation for freight train:
(2) +180+=+%28+s-20+%29%2At+
------------------------
(1) +t+=+280%2Fs+
Substitute (1) into (2)
(2) +180+=+%28+s-20+%29%2A%28+280%2Fs+%29+
(2) +180s+=+280s+-+5600+
(2) +100s+=+5600+
(2) +s+=+56+
and
+s+-+20+=+36+
The speed of the passenger train is 56 mi/hr
The speed of the freight train is 36 mi/hr
-------------------------------------
check:
(1) +280+=+56%2At+
(1) +t+=+5+
and
(2) +180+=+%28+56-20+%29%2At+
(2) +180+=+36t+
(2) +t+=+5+
OK
D = -1<x<5
R = -3<y<3
ps can I have a brainliest
The answer is 5,852 deer.
The density is 11 deer per 1 square mile. The question is how many deer are per 532 square miles:
11 deer / 1 square mile = x / 532 square miles
x = 532 square miles * 11 deer / 1 square mile
x = 5,852 deer
Therefore, there are 5,852 deer in the county.
Answer:
It is a letter with ^ before the expression.
