How much would it cost to cover the entire land area of united states (including alaska and hawaii) with dollar bills?

1X10^15 dollars

Explanation:

area of USA= 4,461,328 mi^2

area of dollar bill= 16.0254 in^2

convert in^2 to mi^2

(16.054 in^2)(1mi^2 /4014489600 in^2)=3.99X10^-9 mi^2

divide area of USA by area of dollar

(4,461,328 mi^2) / (3.99X10^-9 mi^2) =1X10^15 dollars

i think it because equal matrices have equal dimensions, only square matrices can be symmetric. for all indices and . every square diagonal matrix is symmetric, since all off-diagonal elements are zero. in linear algebra, a real symmetric matrix represents a self-adjoint operator over a real inner product space.