Could u plz answer question 3,4,5 and 6 plz

3. Solve using only exact values. Write all answers in simplest terms a) 105x + 4 = 10003x b ) 232x - 1 = 143x-7 c) log(x + 5) - log(x + 1) = log3x d) logs(x - 6) = 1 - 10g5(x - 2) 4. lodine-131 is a radioactive substance used in a thyroid test. A 20 mg sample decays to 18.35 mg in 24 hours. What is the half-life of iodine-131? What percent of a sample will be left after 30 days? 5. The world's population was 2.5 billion in 1950. From then, the population has increased by approximately 1.7% per year. a) Based on this model, what is the population today? Is it accurate? b) When will the population reach 8 billion? 6. Find a simplified equation for each of the following if f(x) = 6x2 - 13x - 5, g(x) = 2x3 - 3x2 - 5x, and h(x) = x2. a) y = h(f(x)) b) y = g(h(x) )