Answer:
320
Step-by-step explanation:
That is a description of the formula for the rectangle rule using left endpoints.
Answer:
875
Step-by-step explanation:
30*15=450
30*10=300
20*5=100
12.5+12.5=25
450+300+100+25=875
I worked from bottom to top
Your picture is a bit blurry. What is the equation on WX and on ZY?