Answer:
There are 15 prime numbers less than 50
Step-by-step explanation:
2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53
49,744.8 so round up to 49,745
looks like A, first answer, is correct when using n such that it names what value of the sequence to use like a1 = 4 and so on.
a) 5:3
b) 7.5:5.3
150min : 90min (1 and a half hour)
10 : 6
5 : 3
150 × 10 mm : 1060 mm
1500 : 1060
750 : 530
7.5 : 5.3
