Answer:PROBLEM SOLVINGStep-by-step explanation:Here are the solutions:1. Sum of 12/19 and 2/38:= 12/19 + 1/19 (simplified 2/38 to 1/19)= 13/192. Product of 2/7 decreased by 3/5:First, find the product:= 2/7 × 2/7 = 4/49Then, decrease by 3/5:= 4/49 - 3/5= (4/49) - (147/245)= -143/2453. 1.73 increased by 3.5:= 1.73 + 3.5= 5.234. Total test questions:Let x be the total number of questions.Romeo answered 17/20 of x correctly, which equals 34.17/20 × x = 34x = 34 × 20/17x = 40There were 40 questions on the test.