I need help. I have exam tomorrow. i don't how to do these type of sums. please help1

Paint color preference children adults total 0.6 0.77 liked new paint color disliked new paint color 0.4 0.15 0.23 total 1.0 1.0 1.0 which value for x completes the conditional relative frequency table by column?

Write numerical coefficient of y² in the expression 2x² - 15xy – 7y²

The ratio of the perimeters of two similar triangles is 4: 3. what are the areas of these triangles if the sum of their areas is 130cm2?