The diagram below shows an equilateral triangle ABC with AB = (4x - 9)cm. Diagram not drawn to scale
В B.
Α'
(4x – 9) cm
The perimeter of the triangle is 45 cm.
Calculate the value of x.
[3]
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Which of the binomials below is a factor of this trinominal? x^2-13+30

Ascientist wants to use a model to present the results of his detailed scientific investigation. why would a model be useful? a )because the model makes the concepts easier to understand b) because the model is easy to put together and to use c) because the model prevents other scientists from asking questions d) because the model requires the audience to pay full attention to it i don't know what to choose because between a and d a is much more likely than d because it only wants to get the attention of the audience. i'm confuse.

Find the volume of the solid obtained by rotating the region enclosed by the curves y=1x and y=7^-x about the x-axis. (use symbolic notation and fractions where needed.) volume =