Vrite and simplify an expression to find he total cost of x pencils , 1 poster board , and (x + 1) notebooks.

The expression to find the total cost of x pencils, 1 poster board, and (x + 1) notebooks will be:

Step-by-step explanation:

Consider '' be the number of pencils which were bought

Consider ''  denotes the cost of pencil

Consider ''  denotes the cost of poster board

Consider '' be the number of notbooks which were bought

Consider ''  denotes the cost of notebook

As we have to find the total cost. Let 'C' denotes the total cost

so the expression becomes

simplifying

Therefore, the expression to find the total cost of x pencils, 1 poster board, and (x + 1) notebooks will be:

{3 + i, 3 - i, 3, -1}

step-by-step explanation:

for the friend request.

when a figure, such as triangle (xyz) is reflected over the line y = x to create x'y'z' the x-coordinates and y-coordinates of the original image (pre-image) will be reversed for the image. (e.g., (x, y) > (y, x)) this means that the pre-image position of the x- and y-coordinates switch places which in turn provides a mirror like image of the original xyz.  

i notice that when i draw a line segment from x to x', that the points are parallel from each other -- they are exactly across from each other and do not intersect with any other points.  

yes, think i would see the same characteristic if you drew the line segment connecting y with the reflecting line and then y' with the reflecting line because of the essence of reflections. because it is a mirror image, each point was effected the same way which leads me to conclude that they same would apply to y and y'.