Answer:
6x-10
Step-by-step explanation:
2(3x-5)
6x-10
A)180°-50°-45°=85
x=85
B,A,C#
B)R,Q,P#
Answer:
21-9x12
Step-by-step explanation:
The answer is 5 buses.
128/30= 4.2....
Round to 5 for the extra children not on the fourth bus.
So 1 nickle=5 cents
1 quarter=25 sents
q=number of quarters
n=number of nickles so
total is
q+n=20
5n+25q=400 (since 100 cents=1 dollar and 4 dollares=400 cents)
SO THE 2 EQUATIONS WOULD BE
n+q=20
5n+25q=400
so q+n=20
subtract q from both sides
n=20-q
subsitute 20-q for n in the second equation
5(20-q)+25q=400
distribute
100-5q+25q=400
add like terms
100+20q=400
subtract 100 from both sides
20q=300
divide both sides by 20
q=15
thhere are 15 quarters
subsitute 15 for q in first equation
15+n=20
subtract 15 from both sides
n=5
5 nickles
15 quarters
