Since there are three variables and three constants you add like terms.
3(x+15) = 3x + 40
1m is equal to 100cm, so the scale reduces the size of the actual object
Answer:

Step-by-step explanation:
We have:
(1) two trapezoids with bases b₁ = 7cm and b₂ = 5cm and the height h = 4cm
(2) three rectangles 3 cm × 7 cm, 3 cm × 4 cm and 3 cm × 5 cm.
The formula of an area of a trapezoid:

Substitute:

Calculate the areas of the rectangles:

The Surface Area:

Answer:
1kg = 1000g
400g = 0,4 kg
0,4 - 1
1 - n
multiply diagonally
0,4*n = 1
n=10/4=2,5
1:2,5 is correct answer
Step-by-step explanation: