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How do I calculate a percentage increase? For example; there are 15 fish in a fish tank, after a year they have bred and now there are 20 fish in the tank. By what % has the number of fish increased?

Original value = 15 New Value = 20 Difference = New value - original value 20 - 15 = 5
(Difference / original) x 100(5/15) x 100 = 33.3%

Answered by Seyi A. • Maths tutor

2625 Views

What tenses can the 'If' clause followed by Present Indicative trigger?

There are essentially 3 different types of 'If' clauses that you will ever need in Spanish.The first one is when the 'Si' clause (Spanish 'If' clause) is used to describe a situation that may well be fulf...

Answered by Yasmin B. • Spanish tutor

1652 Views

Explain the use of the regular present subjunctive in French

The subjunctive mood is used in a variety of different circumstances. It’s important to remember that it is a mood, not a tense. This means it can be used in different tenses. First, let’...

Answered by Priya R. • French tutor

1326 Views

Circle with centre C, and points A,B,D and E on the circumference of the circle. BD is the diameter of the circle. Angle CDA is 18 deg and angle AED is 31 deg. Find angle EDA.

Circle theorem: angle in a semi-circle is a right angle.Therefore angle BAE = 90 + 31 = 121 degrees ABDE is a cyclic quadrilateral and:Circle theorem: Opposite angles in a cyclic quadrilateral sum to 180 ...

Answered by Jasmin H. • Maths tutor

5323 Views

A curve has parametric equations: x=(t-1)^3 and y= 3t - 8/(t^2). Find dy/dx in terms of t. Then find the equation of the normal at the point on the curve where t=2.

dx/dt = 3(t-1)²dy/dt = 3 + 16t^-3dy/dx=(dy/dt)(dt/dx) dy/dx = 3 + 16t^-3/ 3(t-1)²
At t=2 dy/dx= (3 + 16/8) / 3 = 5/3 Gradient of the normal = -3/5with t=2 y...

Answered by Jasmin H. • Maths tutor

3509 Views