Tanner is ordering a pizza at a restaurant. the cost of a cheese pizza is $8.69, and then it costs $0.30 for each additional topping. which equation represents the cost in dollars, c, of a pizza from this restaurant with a certain number of additional toppings, t?
a.
c = 8.69 + 0.3t
b.
c = 0.3 - 8.69t
c.
c = 8.69 - 0.3t
d.
c = 0.3 + 8.69t

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?

Which coefficient matrix represents a system of linear equations that has a unique solution ? options in photo*

Ineed with question three. i don't understand how i'm supposed to achieve 3 marks.