What is the number if 80% of 50% of it is 0.72?

First find out what 0.72 is 80% of. So you would have your ratio 0.72/x = 80/100. To find out you cross multiply and divide so you would have 0.72 × 100 (72) then divide by 80 which is 0.9. To find what 0.9 is 50% of you can do the same thing or multiply 0.9 by 2 which is 1.8

Step-by-step explanation:

answer is 8x+24

area of vanessa's patio = length × width

given, length = (3x² + 5x + 10)

width = (x² - 3x - 1)

area of vanessa's patio = (3x² + 5x + 10)(x² - 3x - 1)

= 3x²(x² - 3x - 1) + 5x(x² - 3x - 1) + 10(x² - 3x - 1)

= 3x⁴ - 9x³ - 3x² + 5x³ - 15x² - 5x + 10x² - 30x - 10

= 3x⁴ - 4x³ - 8x² - 35x - 10

hence, expression of vanessa's patio = (3x⁴ - 4x³ - 8x² - 35x - 10)