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2 years ago

How do you simplify 4+6(7x+7)

2 answers:

4 0

Alright!

To simplify 4 + 6(7x + 7), we must combine like terms. Right off the bat, we can see what we have to do thanks to the order of operations.

* original equation
4 + 6(7x + 7)

* alright, so - since we can't do anything in the parenthesis, we now have to see what we can do multiplication wise.
4 + 42x + 42

* alright, so we could multiply the two 7's by 6, but now what? well, we can't do anything else to the 42x because of the variable, so we have to now add 4 and 46!

and our simplified equation is... 42x + 46! =)

12345 [234]2 years ago

3 0

4+6(7x+7)
= 4 + 42x + 42
= 42x + 46

hope it helps

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Answer:

Time taken by the un powered raft to cover this distance is T = 192.12 hr

Step-by-step explanation:

Let speed of boat = u $\frac{km}{hr}$

Speed of current = v $\frac{km}{hr}$

Let distance between A & B = 100 km

Time taken in downstream = 32 hours

$32 = \frac{100}{u +v}$

$u + v = \frac{100}{32}$

u + v = 3.125 ------ (1)

Time taken in upstream = 48 hours

$48 = \frac{100}{u -v}$

$u -v = \frac{100}{48}$

u - v = 2.084 ------- (2)

By solving equation (1) & (2)

u = 2.6045 $\frac{km}{hr}$

v = 0.5205 $\frac{km}{hr}$

Now the time taken by the un powered raft to cover this distance

$T = \frac{100}{v}$

Because un powered raft travel with the speed of the current.

$T = \frac{100}{0.5205}$

T = 192.12 hr

Therefore the time taken by the un powered raft to cover this distance is

T = 192.12 hr

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