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How do I form the present perfect tense?

To form the present perfect tense we combine the AUXILLARY VERB (conjugated in the present tense) with the PAST PARTICIPLE

EXAMPLE: I have watched, <...

Answered by Olivia P. • Spanish tutor

1958 Views

Why do I keep getting the wrong answer when tackling percentage change questions?

Percentage change isn't always as simple as you think. Whilst taking into consideration if it is a percentage increase or decrease, you also need to consider whether you're calculating a result before or ...

Answered by Emma S. • Maths tutor

2716 Views

N/A

For English B the questions take on the form of reading and writing exercises - thus it is extremely difficult for me to come up with a "question" per se - the way of tutoring for English B that...

Answered by Aleksander L. • English tutor

2005 Views

The probability of obtaining heads on a biased coin is 0.4. The coin is tossed 600 times. Write down the mean number of heads and the standard deviation of the number of heads.

The distribution of heads on a biased coin will be binomial - there are only two possible outcomes for a given throw (disregarding the coin standing upright after a toss). Thus X ~ B(600, 0.4) - where X i...

Answered by Aleksander L. • Maths tutor

15055 Views

Describe the course taken by a deoxygenated red blood cell returning to the heart from the circulation, naming any vessels or chambers along its course.

Following its return to the right atrium via the vena cava, the RBC passes through the mitral valve and into the right ventricle. Upon ventricular contraction, the RBC is ejected via the pulmonary valve a...

Answered by William B. • Biology tutor

2268 Views