The "basic" trig functions -  sine, cosine, etc. -  return an angle's value.

To find an angle, we would have to use an inverse trig function......!!!!!

0.3=0.1658ln(x)+1.0891     subtract 1.0891 from both sides

-.7891 = .1658 ln(x)            divide both sides by .1658

-4.7593486127864897 = ln(x)

This says, in exponential form, that e^ -4.7593486127864897 = x = 0.0085711907435468881

2/3

This one......

x + (x + 5) = 77

It means that prices are doubling over some period of time.......(usuallly, one year)......

That's

GOO     GULL  ......   !!!!

Let's find the voume of the pool...it's a "cylinder," so the volume is given by...

pi x r^2 x h = pi x (10 ft)^2 x (4 ft)  = about 1256.64 cubic ft

And it is being filled with  20 /7.5  = 8/3 cubic ft of water per min

So...the number of minutes it takes to fill the pool is

1256.64 / (8/3)  = 471.24 min

And dividng this by 60, we have...7.854 hrs

Let's figure how much is used in a week....= 223(5) + 1326 = 2441 cups

Now, there are 52 weeks in a year.....can you figure it out  ....???

Thanks for that nice answer, Shaniab  !!!

OK....good deal....!!!