The expression 2a+1.5b gives the cost (in dollars) for a cupcakes and b cookies at a bake sale. a. the cost for 1 cupcake is $ and the cost for 1 cookie is $*insert number here* b. the total cost for 6 cupcakes and 6 cookies is $*insert number here*. c. is $20 enough to buy 7 cupcakes and 4 cookies? *yes or no*

We are given expression:

2a+1.5b, where a is the number of cupcakes and b is the number of cookies at a bake.

a is being multiplied by 2 and b is being multiplied by 1.5.

Therefore,

B. The total cost for 6 cupcakes and 6 cookies is

C. Cost of 7 cupcakes and 4 cookies = 2×7 + 1.5 × 4 = 14 +6 = $20 .

Yes,  $20 is enough to buy 7 cupcakes and 4 cookies.

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

x+14

step-by-step explanation: