Answer:
28
Step-by-step explanation:
70% of the 40 items are pencils.
0.70 × 40 = 28
28 of the items are pencils.
Given that initial time for jogging is,

After each week the time is increased by

This gives an arithmetic sequence.
To find n such that,

Therefore,

So,

Therefore, 9 weeks before you are up to jogging 70 minutes.
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Answer:
9(7+9)
Step-by-step explanation:
The greatest common factor in this situation is 9 so you could factor out 9 and get 9(7+9) you can check this answer by multiplying both numbers by the number on the outside of the parenthesis.
hope this helps mark brainliest please