4n - 2 + 90 + 3n + 8 = 180
7n + 96 = 180
7n = 84
n = 12
Answer:
-33
Step-by-step explanation:
first you should power number 2 to 2 and then multiply by 9 finally abstract it by 3
Answer:SAS
Step-by-step explanation:
the SAD ( or side-angle -side ) postulate basically states that if two sides of of two triangles ana the included angle are congruent , the two triangles are in fact congruent ( if that makes sense)
Y/3-a=b
First multiply 3 on both sides
y/3-a=b
*3 *3
---------------
y-a=3b
Now add the a on both sides
y-a=3b
+a +a
----------------
y=3b+a
Your answer is
Y=3b+a
Since the first car travels 55 miles per hour and starts an hour early, by 4:00 it is 55 miles away from the other car. Therefore, the equation is 55+a(some value)+b(another value)=380. If a car travels 55 miles per hour, that means that we add 55 for each hour and 55*x (if x is the number of hours) is the distance traveled. We have accounted for the first hour, so this is similar to saying that they start 55 miles away at 4:00 and go from there. For the other car, since it travels 75 miles per hour, its distance in hours is 75*x (the amount of time spent should be the same if we start at 4:00). Therefore, since they travel away from each other, our total distance is 55+55x+75x=380. Subtracting 55 from both sides (and combining like terms), we get 130x=325. Next, we divide both sides by 130 to get 2.5 hours, or 2 hours and 30 minutes
hope that helps
