- Find the difference quotient f(x)=2x^2+7x+5?

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Could someone help me with these math problems? I can't figure them out. Solve the linear equation;
x+2y=15
y=-2x+0 9x-12y=-3
-12x+16y=4? A constant current of 1A flow in circuit over period of 5s.total charge flowing through circuit over this duration will be.
Expert plz and? 15.00g of Si reacts with 25.00g of F2 to produce 28.67g of SiF4. Which reactant is the limiting reagent? What day will it be exactly 6 months from June 14th, 2017? Best answer gets buncha stars? If a+b+c=4, ab+ac+bc=6, and abc=3, what is 1/a + 1/b + 1/c?