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Cet été, je suis allée en Espagne avec ma famille et mes grandparents. On a séjourné dans une villa pendant une semaine. Il y avait une grande piscine et quatre chambres. C'était magnifique! Un jour, nous...

Two oceanic plates are converging and the faster moving or slightly denser one subducts. The basaltic rock of the subducted plate starts to melt and rises through the mantle to form a submarine volcano. O...

Blake's London expresses ideas of oppression through a variety of means. Structurally, the poem's rigid rhyme scheme of ABAB, in tandem with the fixed structure of four quatrains, reflects how Lo...

Base Case n=1sum_1(r3^(r-1))=13^0=1=1/4+(3^1/4)(2-1)=1/4+3/4=1
Assume true for n=ki.e. sum_k(r3^(r-1))=(3^k/4)(2k-1)
then for n=k+1sum_(k+1)(r3^(r-1))= sum_k(r3^(r...