Apple Inc. delivered a mixed outlook to investors in its first quarterly report under Chief Executive Officer John Ternus, with tightening profit margins overshadowing an upbeat sales forecast. Though Apple predicted revenue growth of 7% to 10% during the holiday season — beating the 6.1% estimated by Wall Street — the company warned that gross margins would be thinner than projected. It’s also suffering from supply constraints that will make it harder to capitalize on a wave of new products.