10 things you need to know before the opening bell

Here is what you need to know.

The US dollar nears a 4-month high. The US Dollar Index trades up 0.36% at 95.09 and is threatening its best level since the middle of July.

The Reserve Bank of Australia is worried about household debt. The central bank held its benchmark interest rate at 1.50% and warned, "Household incomes are growing slowly and debt levels are high."

Oil hits its best level in 2.5 years. Brent crude oil hit $64.65 early Tuesday as political tensions in Saudi Arabia remain elevated.

Goldman Sachs says Bitcoin could get close to $8,000. "It exceeded an equality target from the July low at 6,044," Goldman Sachs technical head Sheba Jafari wrote. "This break indicated potential for an impulsive advance, one that could reach at least 7,941."

Disney has reportedly been in talks to buy most of 21st Century Fox. A deal would exclude Fox broadcast network and Fox's sports channels, according to CNBC's David Faber.

Broadcom offers to buy Qualcomm in the largest tech deal ever. The offer of $60 in cash and $10 a share in Broadcom shares values Qualcomm at about $130 billion on a pro forma basis, including $25 billion of net debt.

Salesforce reveals its 2019 guidance. A press release issued at Salesforce's 170,000-person tech conference said the company expects to finish its next fiscal year with revenue of between $12.45 billion and $12.5 billion, making for about 20% growth versus the current year.

Stock markets around the world are mixed. Japan's Nikkei (+1.73%) led the advance in Asia and Britain's FTSE (-0.17%) lags in Europe. The S&P 500 is set to open little changed near 2,591.

Earnings reporting remains heavy. Mallinckrodt and Valeant report ahead of the opening bell while Snap releases its quarterly results after markets close.

US economic trickles out. JOLTS Job Openings will be released at 10 a.m. ET. The US 10-year yield is up 1 basis point at 2.33%.