Answer:
a) 
Step-by-step explanation:
this is a right triangle so you can use the Pythagorean Theorem:
the sum of the legs, squared, is equal to the hypotenuse, squared
10² + b² = 13²
100 + b² = 169
b² = 69
b = 
Answer: (iii) Profit The marked price of an article is 15% above its selling price and the cost price is 25% less tha its marked price. Find the discount percent and gain percent.
Step-by-step explanation: