SOLUTION: Good day to all,I need some help with some problems,the first one is,Evaluate 2x^-1y^3 if x=2 and y=-1.The next one is,Express 7,200,000,000 in scientific notation.The next one is,

Question 86338: Good day to all,I need some help with some problems,the first one is,Evaluate 2x^-1y^3 if x=2 and y=-1.The next one is,Express 7,200,000,000 in scientific notation.The next one is,Express (1.4 times 10^7)(2.5 times 10^2)in scientific notation.And the last one is,Evaluate -5x^4z,if x=-2 and z=3.Thanks to whoever can help me.
Answer by jayanthihemkos@yahoo.com(87) (Show Source): You can put this solution on YOUR website!
2x^-1y^3 if x=2 and y=-1
2(2)^-1*(-1)^3
2*1/2*-1 (2*1/2 gets cancelled and we get 1)
1*-1
=-1
2) Express 7,200,000,000 in scientific notation
72*10^8
7.2*10^9
3) (1.4 times 10^7)(2.5 times 10^2)in scientific notation

3.5*10^10
4) -5x^4z,if x=-2 and z=3.
plugin the value of x an d z
-5(-2)^4(3)
-5(32)(3)
-5(96)

-480

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