Based on the graph, how many calories will Colin burn if he walks 3 mi.?

WILL GIVE BRAINLIEST

galina1969 [7]

Answer:

x= 3 inches

Step-by-step explanation:

-The volume of a box is given by the formula:

$V=lwh\\\\l-length\\w-width\\h-height$

-We are given the dimensions h=x+2, l=2x+5 and w=4x-1.

We substitute this values in the formula and equate to the volume value.

$V=lwh\\\\605=(x+2)(2x+5)(4x-1)\\\\605=8x^3+34x^2+31x-10$

#We take the values to the same side and equate to zero;

$8x^3+34x^2+31x-615=0\\\\\\\#Factor\\\\\\(x-3)(8x^2+58x+205)=0$

#Applying the zero factor principal to obtain the different values of x:

$(x-3)=0\\\\\therefore x=3\ \ \ \ \ \ ...i\\\\(8x^2+58x+205)=0$

#We use the quadratic formula to solve the two other values of x:

$(8x^2+58x+205)=0\\x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}\\\\=\frac{-58\pm\sqrt{58^2-4\times 8\times 205}}{2\times 8}\\\\x=-3.625+3.533i \ and \ x=-3.625-3.533i$

The two other values are negatives. Ignore them since length cannot be a negative.

The only reasonable value of x is x=3

#We substitute in the formula to validate:

$V=lwh\\\\=(x+2)(2x+5)(4x-1)\\\\=(3+2)(2*3+5)(4*3-1)\\\\=605$

Hence, the value of x is 3 inches

7 0

3 years ago

A ladder 25 feet long is leaning against the wall of a house. The base of the ladder is pulled away from the wall at a rate of 2

tatuchka [14]

Answer: 6.86 ft per second

Step-by-step explanation:

Both the top and the bottom of the ladder will be moving at the same time.

Given that the base of the ladder is pulled away from the wall at a rate of 2 feet per second when its base is 7 feet from the wall. Then the time will be

Speed = distance/time

2 = 7/t

t = 7/2 = 3.5 seconds

Using pythagorean theorem to get the length L of the wall

L^2 = 25^2 - 7^2

L = 24

The ladder will move down the length at the same time.

Rate = 24/3.5

Rate = 6.86 ft/s

3 0

3 years ago

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