The total surface area of this cuboid is 112cm squared find the value of x

 or  

Step-by-step explanation:

we know that

The surface area of a cube is equal to

where

x is the length side of a cube

In this problem we have

substitute in the formula and solve for x

square root both sides

The total surface area of this cuboid is 112 then the value of x is 2.65cm and this can be evaluated by using the total surface area of the cuboid formula.

Given :

The total surface area of this cuboid is 112

The total surface area of the cuboid is given by:

  ---- (1)

where 'x' is the side length of the cuboid.

Now, put the value of the surface area of the cuboid in equation (1).

x = 2.65cm

Therefore, the total surface area of this cuboid is 112 then the value of x is 2.65 cm.

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walter needs to make at least 5 more cookies but no more than 40. 5 ≤ x ≤ 40

step-by-step explanation:

20 ≤ x + 15 ≤ 55

subtract 15 from all parts

20-15 ≤ x + 15-15 ≤ 55-15

5 ≤ x ≤ 40

this means how many more cookies he has to make

walter needs to make at least 5 more cookies, but no more than 40 cookies; 5 ≤ x ≤ 40