Answer:
solve the last equation for b then solve the first equation for a, after you have a plug that in to find c.
Step-by-step explanation:
a=5+b
c=2a
a+b+c=225
(5+b)+b+(2a)=225
(5+b)+b+[2(5+b)]=225
Remark
You can use a method called unit analysis to solve this problem. You will use it many times in your education later on.
Solve

Now sort out the numbers in the numerator and those in the denominator and multiply them together.
<em><u>Numerator</u></em> 28 * 5280 * 1 * 1 = 147840
<em><u>Denominator:</u></em> 60 * 60 = 3600
Now divide the numerator by denominator
Answer = 147840 / 3600 = 41.1 Feet / second
28 miles per hour = 41.1 feet / second
Answer:
17
Step-by-step explanation:
2a+30 = 4a-4
+4 +4
2a+34 = 4a
-2a -2a
34 = 2a
÷2 ÷2
a=17
Hope this helps! :)
Replacing x by 2 and y by we can see which one is correct
Just see if these 2 values fit
The answer is B 3x + 2y = 6
because LHS = 3(2) + 2(0) = 6 + 0 = 6 = RHS