Help please with surface area
I know the answer I just need help showing my work
Picture below

Problem 1

SA = 430.0

Step-by-step explanation:

13*11=143 divided by 2 is 71.5 (front face of the figure)

13*11=143 divided by 2 is 71.5 (backk face of the figure)

13*7=91 (left side rectangle)

17*7=119 (right side face rectangle)

11*7=77 (base)

Add all together 71.5+71.5+91+119+77=430.0

Problem 2

10*9=90 divided by 2 = 45 (front face triangle)

10*9=90 divided by 2 = 45 (back face triangle)

10*9=90 (right side rectangle face)

10*13.5=135 (left back side rectangle face)

10*10=100 (base)

Add everything together

45+45+90+135+100=415.0

Hope this helps!

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional