hey Guys, im having a bit of trouble working out some questions i need to how to work out by tomorrow. I feel stupid for not thinking of this earlier but i have been flat out with study.(adsbygoogle = window.adsbygoogle || []).push({});

can you help me work out these questions and show me how its done.

Solve for X in the quations.

1) 2^4x = 16

2) ln(2x-5) = 1.9

3) logbase7(x) = 5

4) the intensity I of light passing through a window, measured in lumens, is given by the formula

I(d) = 52e^-4.5d

(i) where d is the thickness (in centimeters) of glass in the window.

find the intensity if the thickness is 2.2 cm

(ii) find the thickness required to give an intensity of 12 lumens. give answer in centimeters to at least three decimal places.

5) Explain why the quadratic equation x^2-6x+140=0 has no real solution for x.

6) on dividing (x+2) into 2x^5-3x^2+x-1 there is both a quotient and remainder.

Thus 2x^5-3x^2+x-1 = q(x)(x+2) + R

where q(x) is a polynomial in x of degree 4, and R is a constant. Find R?

7)

Find all solutions to the system.

x-2y+2z = -6

3x-5y+6z = -15

2x+4y-12z = 44

8) write the equation 5x+3y = 4 in parametric form. That is express both x and y in terms of the same parameter

9) solve x(2x-3)^2 = 4x^3+7x-60 for x

Hope this isnt to much to ask. I will be so very thankfull to anybody who can help me.

Thanx in advance

Hayz

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