Represent multiplication word problems with variables.

one shirt costs $15. write an equation to find out how much 10 shirts cost.

a: c x 15 = 10
b: 15 x 10 = c
c: 10 ÷ 15 = c
d: c x 10 = 15
e: 10 - 15 = c

which one is correct?

B. 15*10 = c

Step-by-step explanation:

$15.00 is per shirt, meaning that for every shirt there is $15 as the price for that shirt.

‘c’ represents the amount of the total cost, so B is your correct answer.

Ps: c= $150.00 which is the cost of 10 shirts.

Hope I helped!

4) is the opposite function of 3), and vice versa. Because f(x) =2x-1 and  its opposite f(x)=-2x+1. And we can see them both in pictures 3 and 4.

Step-by-step explanation:

A piecewise function is a function defined in a sequence of  intervals. The most known piecewise function is the modular function. (1st picture)

An opposite function is given by f(x)=-x of f(x)=x

The following pictures describe the following functions:

1) f(x)=-|2x|+2

2) f(x)= 2.34x-2.34 and f(x)= -2.34x-2.34

Notice how the second function express the opposite line, by the opposite angular coefficient.

3) f(x) =2x-1 and f(x)=-2x+1

4) f(x) = -2x+1 and f(x)=2x-1

Different intervals but the same functions are graphed in 3 and 4. So the graph of f(x)=2x-1 and its opposite f(x)=-2x-1