Tammy cuts four identical circles from a square piece of black poster board as shown. What is the area of the leftover poster board? a) 6.240 square feet
b) 5.375 square feet
c) 18.760 square feet
d) 19.625 square feet

45 was divided by a power of ten to get 4.5. what power of ten was it divided by? people 4.5

Fa bus driver leaves her first stop by 7: 00 a.m., her route will take less than 37 minutes. if she leaves after 7: 00 a.m., she estimates that the same route will take no less than 42 minutes. which inequality represents the time it takes to drive the route, r?

Each person in an it department of 25 people works on at least one of 3 major projects: system security, program implementation, platform development. 10 people work on system security, 13 work on program implementation, and 12 work on platform development. 4 people work on system security and platform development, 5 people work on program implementation and platform development, and 2 people work on all three projects. how many people work on system security and program implementation?