Stocks saw choppy trading on Tuesday as gains in tech giants Apple (AAPL) and Alphabet (GOOGL) helped to offset pessimism stemming from the latest signs of a slowdown in China. Twitter (TWTR) boosted the Nasdaq after announcing it will cut around 8% of its workforce as part of a restructuring plan. The social network expects to incur as much as $20 million in costs tied to severances. FMC Corp (FMC) has joined rivals Monsanto (MON) and DuPont (DD) in forecasting lower full-year earnings in the wake of weakened agricultural demand. The chemicals company also announced it will cut as many as 850 jobs, or around 12% of its total number of employees. Hewlett-Packard Enterprise's (HPQ) board has approved a $3 billion share buyback program.