samanthaxv

-5(r+8)= -61

-5r-40 = -61 Note I distributed the 5 into the parenthesis 

-5r = -21 Note I moved the -40 to the right side of the equation

r = -21/-5

r = 21/5 Note I divided each side by -5

That symbol is called a bracket! It is mostly used in graphing in math classes. Brackets generally denotes some form of grouping. Another time it is used ih graphing piece wise functions. For example, if you have seen open and closed circles in graphs, the point on the closed circle will have a bracket 

Sine is used in many different areas of math. From my current experience in high school calculus, sine is used in the unit circle, graphing sine itself, and incorporation with trigonomic ratios in including Law of Sine and the Ambigious Case.

The number given is 216k, or 216000.

Using a calculator, you could just simply plug in radical 216000.

Once you get the number (which in this case is 464.758001545), you plug it into the 4th power.

Once you plug it to the 4th power, the answer should be 46656000000

Or in scientific notation: (4.6656 × 10^9)

Negative 2/3 looks like -2/3 or -0.66666666666.

Negative 3 is -3.

Negative 2.4 in -2.4.

The square root of 9 equals to 3.

The only number that isnt negative is the square root of 9. The square root of 9 is positive three (3). Therefore, the square root of 9 is the biggest out of the other numbers.

First, combine like terms. The like terms in this equation at 2x and -3x. Once you combine the like terms, you should get -1x or -x. Next is to move the 4 to the other side of the equation sign. To do this, subtract 4 on each side. The final equation should look like -1x=-15. Then just divide each side by -1 and you will find x.