Answer:
13. c
14.a
15.c
16.d
17.b
18.d
19.a
20.b
Step-by-step explanation:
Answer:
Option A. 
Step-by-step explanation:
step 1
Find the area of the brownie pan
The area of the trapezoid is equal to

step 2
To calculate the number of days, divide the total area of the brownie pan by 30 square centimeters of brownie
so

Answer:
-3/5
Step-by-step explanation:
tan = opp/adj using pathagorean the hypt is 5
cos = 3/5
tan is negative in quad 2 and 4
sin is positive in quad 1 and 2
so because tan is negative and sine is positive the cosine is negative
-3/5
Answer:
= (xa+b)a-b .(xb+c)b-c. (xc+a)c-a
Or
= x(a+b)(a-b). x(b+c)(b-c) .x(c+a)(c-a)