Answer:
Speed of car B is 33 km/h and speed of car A is 
Step-by-step explanation:
Let speed of car B be 
km/h
Speed of car A is 12 km/h more than car B.
Therefore,
Speed of car A = 
km/h
Distance = Speed × Time
Distance travelled by car A in 4 hours = 
km = 
km
Distance travelled by car B in 4 hours = 
km
Also, cars A and B are 312km apart after 4 hours.
Speed of car B is 33 km/h and speed of car A is 
Answer:
is a root.
is correct.
Step-by-step explanation:
As
is a factor of 
then it must be
is a root.
Therefore,
is correct.
Answer:
see below
Step-by-step explanation:
Let's solve your equation step-by-step.
3(
77
2
−
5
2
y)+7y=111
Step 1: Simplify both sides of the equation.
3(
77
2
−
5
2
y)+7y=111
(3)(
77
2
)+(3)(
−5
2
y)+7y=111(Distribute)
231
2
+
−15
2
y+7y=111
(
−15
2
y+7y)+(
231
2
)=111(Combine Like Terms)
−1
2
y+
231
2
=111
−1
2
y+
231
2
=111
Step 2: Subtract 231/2 from both sides.
−1
2
y+
231
2
−
231
2
=111−
231
2
−1
2
y=
−9
2
Step 3: Multiply both sides by 2/(-1).
(
2
−1
)*(
−1
2
y)=(
2
−1
)*(
−9
2
)
y=9
Answer:
y=9
