- What decimals add and minus to make - 2? Example 2.3+-4.3= - 2?? Thanks?

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Did Haiti earthquake reduce the circumference of earth? Is it possible to wire in a safety device to thermocouple? Really Important! Math help please!? Isolate x in the equation: asin(bx) = ccos(bx)? If n is positive integer then 2n^4 - 41n^3 + 18n^2 + 63n + 23, 40n^4 - 89n^3 + 64n^2 + 99n + 57 are not both prime. Proof or counterexample?