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How do I remember the differences between the the two tenses; the imperfect and preterite?

This is the way I always remember the difference. The preterite tense is the past. The imperfect tene is the ongoing past. The preterite tense means that an action in the past has finished. For example, you ...
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Answered by Clara B. • Spanish tutor
3128 Views

(C3) Show that 4csc^2(x) - cot^2(x) = k can be expressed as sec^2(x) = (k-1)/(k-4) where k != 4

The student can answer this in several ways. One using the simple, known identities csc= 1/sin, cot=1/tan, sec=1/cos, tan=sin/cos, sin^2 + cos^2 = 1 and basic algebra is the following: 4csc^2 - cot^2 = k4/si...
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Answered by Fearghus H. • Maths tutor
4330 Views

Describe mitosis as part of the cell cycle

Define mitosis: a process of cell division where a single cell splits into two identical daughter cellsWhen does it occur? When the body requires more cells for growth.The overall process has 5 steps.Interph...
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Answered by Chloe T. • Biology tutor
4938 Views

The ratio of Adam's age to Bob's age is 1:2. In 12 years time, the ratio of their ages will be 3:5. Calculate their current ages.

Now: In 12 years:A:B A:B1:2x:2x x+12:2x+12 = 3:5 x+12 = 2x+12 3 55(x+12) = 3(2x+12)5x + 60 = 6x + 36x = 24 A:B Adam = 24, Bob = 48x:2x24:2(24)24:48
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Answered by Aaron S. • Maths tutor
5294 Views

Find the binomial expansion of (-8+4x)^(2/3) up to and including the term in x^2.

The formula booklet is useful for this type of question, but only once we've rearranged the expression into the correct form. The formula booklet expression is: (1 + z)^n = 1 + n z + 0.5 n*(n-1) z^2 + .... T...
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Answered by David M. • Maths tutor
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