Answer:
the constant proportionality means the ratio between two directly proportional quantities.
so the constant proportionality will be 7.5÷6=1.25 or 10÷8=1.25 or 12.5÷10=1.25
constant proportionality should be same all through because it's a constant
Answer:
2x^2+9x-5
Step-by-step explanation:
(X+5)(x-1/2)
x^2-1/2x+5x-5/2
x^2+9/2x-5/2
multiply through by 2
2x^2+9x-5
The lines that intersect is B
From the information obtained from the question, two equations can be created:
Let x and z be the two numbers (parts)

. . . . (1)

. . . . (2)
By transposing (2), make 'z' the subject of the equation

. . . . (3)
By substituting (3) into equation (1) to find a value for x




⇒

∴ either

OR

Thus x = 5 or x = 10
By substituting the values of x into (2) to find z
z + (5) = 15 OR z + (10) = 15
⇒ z = 10 OR z = 5
So, the two numbers or two parts into which fifteen is divided to yield the desired results are 5 and 10.
Answer: 6.79
Step-by-step explanation:
Multiplying by 10 allows you to move the decimal to the right by one place value.