Final answer:
When Jaff counts by tens starting at 290, the next six numbers in the sequence are 300, 310, 320, 330, 340, and 350.
Step-by-step explanation:
If Jaff starts at 290 and counts by tens, the next six numbers he will say are determined by repeatedly adding 10 to the starting number. Knowing this, let's calculate the first six numbers in this sequence:
- 290 + 10 = 300
- 300 + 10 = 310
- 310 + 10 = 320
- 320 + 10 = 330
- 330 + 10 = 340
- 340 + 10 = 350
Therefore, the next six numbers Jaff will say are 300, 310, 320, 330, 340, and 350.