I can answer it but is the “S” supposed to be an integral?
Answer:

Step By Step Explanation:
Area Of Triangle: 
Base: 10
Height: 24 (This triangle has a right angle, so we use the height based off of the 90° angle, which is 24)
Insert Numbers Into Equation

10 = 5

➤ 
Answer:
C
Step-by-step explanation:
Given that he has sold 40% then he still has to sell (100 - 40)% = 60%
60% of 70
=
× 70 = 0.6 × 70 = 42 → C
It's 10.
7*4=28.
280/28 = 10.
Hope this helps.
The answer is 75 because 50+60+115=225 divided by 3 is 75