Obtuse has an angle that is greater than 90 degrees. To be obtuse the angle must be 91 and up. Right triangles are 90-degree angles. Acute triangles have an angle that is less than 90. So, 89 and below.
Valerie would need a new bottle in 7 weeks week 1: 75 -12 = 63 fl oz 2: 63 - 12 = 51 3: 51 - 12 = 39 4: 39 - 12 = 27 5: 27 - 12 = 15 6: 15 - 12 = 3 fl oz week 7: she only has 3 oz of detergent, so she needs more.
