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Both these verbs mean "to be" in Spanish, whereas in English we only have one. This can make it confusing, but there is a general rule you can use to remember which you have to use. "Ser&qu...

When dividing fractions you must remember the KEEP, CHANGE, FLIP rule.

KEEP - The first fraction you KEEP as it is, you don't change it.

CHANGE - You now change the sign from a division to a...

24.50/7 = £3.50 - price of 1 ticket 

63/3.50 = 18 - number of tickets bought total 

18 - 7 = 11 

Gonorrhoea is caused by a bacteria whereas HIV is a virus. Antibiotics are only effective on bacterial diseases, but do not treat viruses as they are found inside the host cell. 

Oxygen moves down the trachea, into the bronchi and into the smaller bronchioles, down a pressure gradient. Once the oxygen reaches the alveoli it moves down a diffusion gradient across the alveolar epith...