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Briefly describe the structure and function of the respiratory system

Structure: The respiratory system starts at the mouth and nose with the pharynx, and continues as the trachea - this is covered with the epiglottis that prevents food and other material entering the lower...

JD
Answered by Joe D. Biology tutor
7528 Views

f(x) = 4x - m, g(x) = mx + 11, fg(x) = 8x + n. m and n are constants. Find the value of n.

If f(x) = 4x - m, and g(x) = mx +11, then the combined functions are: fg(x) = 4(mx +11) -m, or expanded to fg(x) = 4mx + 44 - m.

We are told that this function of 'f' and 'g' can also be written as...

AB
Answered by Angus B. Maths tutor
4230 Views

Expand and simplify the following expression: (2x-1)(3x+2)

Use a double-bracket expansion method such as FOIL (first, outer, inner, last). If you don't know FOIL or how to expand double brackets, don't worry, I will explain it to you in the session.

6x

OB
Answered by Oliver B. Maths tutor
9754 Views

Integrate ln(x) wrt dx

Integrate by parts. First rewrite the integral in the form udv/dx, which is (1)ln(x). Then integrate (1)ln(x) wrt dx by assigning u=ln(x) du/dx=1/x and dv/dx=1 v=x. We can determine the integral of ln...

ST
Answered by Sathurthini T. Maths tutor
4144 Views

Solve 3x2 + 7x – 13 = 0 Give your solutions correct to 2 decimal places.

a=3 b=7 c=-13

Use quad formula: -b+-root[(b^2-4ac)/2a]

Sub in values: -7+-root[7^2-4x3x-13] =1.22 and -3.55

BP
Answered by Bronte P. Maths tutor
5243 Views

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