Answer each of the following questions yes or no, and add up the numbers corresponding to the questions for which the answer is yes. For instance, if the answer to all six questions were 'yes,' then the answer would be $1+2+3+4+5+6=21$.

1. Is $\frac{2}{3x}$ equivalent to $\frac{2x}{3}$?

2. Is $\frac{1-h}{2h}$ equivalent to $\frac{h-1}{2h}$?

3. Is $-(u+u^2)$ equivalent to $-u-u^2$?

4. Is $-(3+y)$ equivalent to $-3+y$?

5. Is $\frac{j}{2}$ equivalent to $\frac{1}{2}j$?

6. Is $x+y+z$ equivalent to $y+x+z$?

a triangular prism is a 3 dimensional shape composed of triangles and rectangles. it is made from two triangular bases and three rectangular sides.  

see explanation

step-by-step explanation:

a

(6r + 7) + (13 + 7r) ( remove brackets and collect like terms )

= 6r + 7 + 13 + 7r

= 13r + 20

b

remove brackets and collect like terms

13 - r - 1 + r

= 12 - r

c

remove brackets and collect like terms

= - 8 - r + 2r - 4

= - 12 + r

d

remove brackets and collect like terms

= 7r - - - 6r

[-   - = - - = - ]

= r -

it is 570

step-by-step explanation: