Solveit

4+2=6

312/6=52(how many times he need to save 4 $)

4x52=208

Answer:208

$2.1\times(4+3.5)\times2^2 \\2.1\times 7.5\times {2}^{2}=63$

standart deviation it is mean how far the number from mean

0/0 = Error: DivByZero

CD-c

DVD-d

 Kate bought 3 used CDs and 1 used DVD at the book store. Her friend Joel bought 2 used CDs and 2 used DVDs at the same store. If Kate spent $20 and Joel spent $22, determine the cost of used CD and a used DVD.

2c+2d=$22  

c+d=11

d=11-c

put d=11-c into 3c+d=$20

3c+11-c=20

2c=9

c=4.5

put c=4.5 into d=11-c

d=11-4.5

d=6.5

yea if you will leave one of the legs

the probability to draw:

black marble: 5/12

green: 1/12

$black, green, black \\ \frac{5}{12} \times \frac{1 }{12 (-1) \text{ because you draw one marble)}} \times \frac{5(-1) \text{ because you draw one black marble)}}{12(-2) \text{ because you draw two marbles)}} \\ (5/12)*(1/11)*(4/10)=1/66$

$4=triangle$

where is the picture ?