Answer: the weight of chalk stick is 25 g
Step-by-step explanation:
Quantity of Carbon in chalk stick = 3 g Let the weight of chalk be x g.
12%of x =3
Answer:
x = ±
Step-by-step explanation:
Given
5 - 2x² = - 15 ( subtract 5 from both sides )
- 2x² = - 20 ( divide both sides by - 2 )
x² = 10 ( take the square root of both sides )
x = ± ← exact solutions
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(y - 6)(3y + 2)
Take the y^2 coefficient 3 and multiply the constant by it, to get y^2 - 16y - 36
Find two numbers that multiply to 36 and add to -16, which are -18 and 2. Use these numbers as the second term in the polynomial, to get (y - 18)(y + 2).
Divide the numbers by the original coefficient
3, and if there’s a fraction, move the denominator to the coefficient of the variable.
(y - 18/3)(y + 2/3) —> (y - 6)(3y + 2)