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swat32
3 years ago
13

Creative Logic: Kevin is hiking on the trail and has to cross a rope bridge. He looks down at the raging river below and is sudd

enly very nervous. The bridge has 20 planks on it and every time he steps forwards five planks, he then steps backwards four planks. How many times must he do this to reach the other side?
Mathematics
1 answer:
Mashutka [201]3 years ago
5 0

Answer: 40 times

Step-by-step explanation:

Given: Total planks = 20

By using integers, Steps forward is represented by +5, Steps backward s represented by  -4.

After first set of two steps ( one forward another backward), 5-4 =1 step forward is captured.

For 20 planks , we require 20 such sets, i.e. he will do this 2x 20 times i.e. 40 times.

Hence, he will do this 40 times to reach the other side.

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13. A contractor buys 8.2 square feet of sheet metal.
Veseljchak [2.6K]

Answer:

x = \frac{183}{6.7}  is the required equation.

The  Per sq ft of sheet costs $ 27.31.

Step-by-step explanation:

The total amount of sheet purchased =  8.8 sq. ft

The amount of sheet used = 2. 1 sq ft.

The worth of remaining sheet = $183

Let us assume the  cost per sq ft of sheet = $x

Now, the remaining sheet =

Amount of total sheet purchased- Amount of sheet used

= 8.8 sq. ft - 2. 1 sq ft. = 6. 7 sq. ft

So, the worth of the remaining sheet 6.7 sq ft is $183.

⇒ Worth of 1 sq ft of sheet = $183 /6.7 sq ft

or, x = \frac{183}{6.7}  = 27.31

or  x = $27.31

Hence, the  Per sq ft of sheet costs $ 27.31.

6 0
3 years ago
Using the distributive property how can I rewrite the expression 4*24
liberstina [14]
You can do 2(2*12) or 4(1*6), personally I think the second one is better. Hope this helps!
6 0
3 years ago
F(x)=3/x+2-√x-3 f(7)=
Paladinen [302]

Divide each term by x and simplify.

(Ok so I don’t make it confusing the first part after “F=“ will be on top The I’ll put the bottom part below oh btw the top and bottom r negative so put the negative sign in front of the fraction)

F= - 21fx+x√x-2x-3(top of fraction)

F=-x^2(bottom of fraction)

6 0
3 years ago
URGENT I NEED AN ANSWER!!! A water tank holds 657 gallons but is leaking at a rate of 4 gallons per week. A second water tank ho
DENIUS [597]

Answer: 73 weeks

Step-by-step explanation:

Equations

657-4w=876-7w

Solve for w

w=73

6 0
3 years ago
Is (-3,11) a solution to the system of equation shown below.
natita [175]
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8 0
3 years ago
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