A man travelled a distance of 61 miles in 7 hours. He covered a part of the distance at a speed of 8 miles/ hr and the remaining
at a speed of 10 miles/ hr. How long did he travel at 8 miles/ hr?
1 answer:
Answer:
4.5 hours
Step-by-step explanation:
8t + 10(7-t) = 61
8t +70-10t=61
-2t = 61-70
-2t= -9
t = -9/-2
t = 4.5
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The best answer for this question is A.
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f
−
1
(
x
)
=
1
2
x
+
5
Explanation:
f
(
x
)
=
2
x
−
10
→
Replace the
f
(
x
)
with
y
y
=
2
x
−
10
→
Switch the places of the x and the y
x
=
2
y
−
10
→
Solve for y
x
+
10
=
2
y
y
=
1
2
x
+
5
The inverse is
f
−
1
(
x
)
=
1
2
x
+
5
Answer:
33
Step-by-step explanation:
First you do 199/4=49
Then 199/12=16
after that do 49-16=33
so the answer is 33
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Answer:
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Step-by-step explanation:
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