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# I neednhelp with this...

Find the half-lives of the substances 1) einsteinium-253, which decays at a rate of 3.406% per day ----------------------------------------------------------------------------- 2) You...

# Logs and natural logs question ...please ? thanks

Let u=log 2 and v=log3. evaluate the following expressions in terms of u and/or v. 1) log 0.08 ------------------------------------------------------------------------------------------------------------ 2)...

# Could someone help me with these please ? I'm a little confused

Express the following in terms of x without logs. 1)ln e^2x 2)e^ln(3x+2) 3)ln(1/e^5x) 4)ln sqrt(e^x)

# Evaluate without using a calculator

1) e^ln2 =x 2) ln(1/sqrt(e))=x 3)(1.45)^x=25 4)10=22(0.87)^q

# sqrt e^9t =e^t

could some one help me with this pre-calc question please ? Logarithms and their properties

# How do you expand ln(4x)(y^1/5)

I am wondering how to expand this log function. This description needs to be 20 words long but you don't need that many to describe this problem. Ya feel?

# cos^2x(sinx) simplify the expression

I have no idea what to doafter this.  I got to    cos^2x/sin^2x (sinx)

# how to factor f(x)=6xcubed-7xsquared-89x+140 completely

This is a pre-calculus question. Its chapter 4 in the Holt pre-calculus textbooks.

# How do I write this is standard form: y= 2(t-1)^2+12

How do I write this equation in standard form? ax^2+bx+C

# p(x)+p(5), if p(r)=4r^2+5

p(x)+p(5), if p(r)=4r^2+5 I do not understand how to do this question I have read over the chapter and I still don't understand how to do this function.

# In the equation 3x+2y=9, if x increases by 2 then y does what?

Increases by 2 Decreases by 6 Increases by 3 Increases by 6 Decreases by 3

# -sin^2=2cosx-2

solve the following equation...I am confused... what i have so far: 2cosx-2+sin^2=0 ....

# 3^(2x)+28=11(3^x)

I can't figure out how to start solving it. Haven't used this site before, please help? I have to find the exact solution in simplified form.

# The focus of a parabola has coordinates (0,-3/10) and the vertex at the origin. Find the equations of the directrix, the axis of symmetry, and the parabola.

This has to do with the focus and directrix of a parabola.

# y=(x^2-x-2)/(x^2-16)

I am trying to find the y-intercepts without using a graphing calculator. How do I go about with that equation?