The basic deal is a^2 + b^2 = c^2
A= incorrect, 81 + 100 does not equal 121.
B= incorrect, 64 + 144 does not equal 256.
C= incorrect, 256 + 1024 does not equal 1280
This leaves D.
D must be a right triangle.
Answer:
4x-5y=40
comparing with y=MX+C (equation of a straight line)
we have,
-5y= -4x+40
divide through by. -5
we have,
y= 4/5X - 40/5
therefore,
y= 4/5X - 8
Hence, 4/5 is the slope while -8 is the y-intercept
4 products are being purchased.
Step-by-step explanation:
Given,
Time taken to select each product = 5 seconds
Time taken to complete check out process = 60 seconds
Total time taken for a transaction = 80 seconds
Let,
x be the number of products purchased.
Time taken for each product*Number of product + Time for check out process = total process

Dividing both sides by 5

4 products are being purchased.
Keywords: variable, division
Learn more about division at:
#LearnwithBrainly
Answer:
1 serving of Roast Beef and 2 servings of Mashed potatoes
EDIT: added photo with work shown