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

Triangle Area = 1/2bh

Rectangle area =bh

Step-by-step explanation:

Triangle Area

10x9=90 (normally you would divide by 2 here, but since there are two triangles the total area would be 90)

Rectangle area (bottom)

10x10=100

Rectagle are (top)

13.5x10 = 135

Add up all values = 325 in squared

walter needs to make at least 5 more cookies but no more than 40. 5 ≥ x ≥ 40;

step-by-step explanation:

walter has to make a minimum of 20 cookies. he already has 15 cookies made, so he must make 5 more to meet the minimum.

the maximum amount of cookies he can make is 55. he already has 15, so he has to make no more than 40 more cookies to meet the maximum.