Brazilian economic activity rose slightly in April, in another lackluster showing for the once-booming class="mandelbrot_refrag"> economy that points to a sluggish second quarter. _0"> The central bank's IBC-Br economic activity index rose 0.12 percent in April from March in seasonally adjusted terms, the bank said on Friday. The median estimate in a Reuters survey of 19 analysts was for 0.0 percent growth. The Brazilian class="mandelbrot_refrag"> economy barely grew in the first quarter and a plunge in investment pointed to more weakness in the coming quarter. Economists have repeatedly revised down their economic growth estimates to just 1.4 percent this year from an expansion of 2.5 percent in 2013. true For Bradesco economists the slight increase in activity in April reinforced expectations that the second quarter will remain subdued. "It is compatible with our expectations for a slowdown in the second quarter," Brad