The table gives information about the times taken, in minutes, by 22 students to cycle a race.
Time (t minutes) Frequency
15 <t< 20
4
20 <t< 25
1
25 <t< 30
7
30 <t< 35
10
Work out an estimate for the mean time.
Give your answer in minutes and correct to 3 significant figures.
+
Total marks: 3​

Ined this is due tomorrow and i dont know the answer can you find all the exponents

The u-drive rent-a-truck company plans to spend $13 million on 320 new vehicles. each commercial van will cost $25 comma 000, each small truck $50 comma 000, and each large truck  $80 comma 000. past experience shows that they need twice as many vans as small trucks. how many of each type of vehicle can they buy?

Given the sequence 7, 14, 28, 56, which expression shown would give the tenth term? a. 7^10 b. 7·2^10 c. 7·2^9