Given that 10^0.48=<em class="ga-var">x, 10^0.70=<em class="ga-var">yand<em class="ga-var">x^{<em class="ga-var">z}=<em class="ga-var">y², then the value of<em class="ga-var">zis close to ___ ?

xz = y2        10(0.48z) = 10(2 x 0.70) = 101.40

 0.48z = 1.40

 z = 140/18 = 35/12 = 2.9 (approx.)