Sandra buys 70 pencils with fuzzy tops. She gives 4 to each of her 15 classmates. The expression for the number of pencils she has left is 70 – (4 • 15) .
Answer each question to identify the parts of the expression.
1. In this expression, what does 70 represent?
3. Is the expression 70 – (4 • 15) a difference of three terms, a product of two terms, or a difference of two terms?
Identify the terms in the expression.

See explanation.

Step-by-step explanation:

In question 1, 70 represents the pencils with the fuzzy tops.

In question 2, The expression 70 - (4 × 15), is a difference in 2 terms because what you are doing first is you are multiplying 4 by 15. 4 × 15 = 60. then, subtract to get the difference. 70 - 60 = 10.

hope this helps.

if the eqn of the parabola is f(x) = (x-4)(x+2), we need to mult. this out to find the coordinates of the vertex.

then f(x) = x^2 + 2x - 4x - 8, and f(x) = x^2 - 2x - 8.

one way in which you can find the vertex is to calculate x = -b / (2a).   here, that comes to

        )

x = = 1.   f(1) = 1^2 - 2(1) - 8 = - 9.   vertex is at (1, -9).

        2(1) 

find another point on the curve:   let x=0, for which y=-8.   then (0, -8) is on the curve.   plot the vertex and this point and draw a smooth parabola thru both.

hope this