CPhill

Expanding, we have

-3a^2 -3ab + 15a - 8a + 8b +ab +3b^2 -7b       And combining like terms

-3a^2 +7a -2ab +3b^2 + b

3.75 grams of copper / 5 total grams =

.75 = 75%

We can use the sine function for this one.....

sine (30) = 9 / ramp length

ramp length = 9 / sine (30)

ramp length = 9 /(1/2)

ramp length = 18 ft.

We could have also used the 30 - 60 - 90 triangle, where the sides opposite these angles have the ratios...... 1 - √3 - 2

So the side opposite the 90 degree angle represents the ramp length and it is twice as long as the side opposite the 30 degree angle (9 ft) = 18 ft

zegroes.......x might take on ANY value......we can't assume that it "usually" stands for "2"

Pay attention.....the "Fossil" knows  !!!!!

And, if you're not careful....you're going to get the "Dinosaur" involved....and you DON'T want THAT !!!!

Move the decimal point 15 places to the left....you'll have 14 zeroes and then 238......etc.

So, each year, the population was 98.9% as much as it was the year before. So we have

3000(.989)¹⁰ =

$${\mathtt{3\,000}}{\mathtt{\,\times\,}}{\left({\mathtt{0.989}}\right)}^{{\mathtt{10}}} = {\mathtt{2\,685.864\: \!943\: \!184\: \!540\: \!916\: \!2}}$$

About 2686 people

A = pi * r^2

A = pi * (8 yd)^2

A = pi * 64 yd^2

A = 64 * pi yd^2

r = 8yd is your answer

C = 2*pi*r

6 = 2*pi*r

r = 3/pi

A = pi * r^2

A = pi * (3/pi)^2

A = 9 / pi

LOL!!!

I'd give you 6 points for that one......if I could!!!!

CD

And I'm still looking for the Roman Numeral "0".......eh, never mind, it's an "inside" joke here on the forum.....