Tammy completed the following steps to simplify the expression
-5x²y - 3xy² - 2(4y + 2) - 2.5x²y.

-5x²y - 3xy² - 2(4y) + 2(2) - 2.5x²y

-5x²y - 3xy² - 8y + 4 - 2.5x²y

(-5x²y - 3xy² - 2.5x²y) - 8y + 4

(-5 - 3 - 2.5)x²y - 8y + 4

-10.5x²y - 8y + 4

Explain why Tammy's solution is incorrect. Then show how to correctly simplify the expression.

The ksp expression for the system pbcl2(s) pb+2(aq) + 2 cl-(aq) is: [pbc12][pb+2][2cl-] [pb+2][cl-]2 [pb+2][2cl-]2 [pbcl2][pb+2][cl-]2 [pb+2][2cl-]2[pbcl2]

Which translation maps the vertex of the graph of the function f(x) = x2 onto the vertex of the function g(x) = x2 – 10x +2?

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?