25 points and a !scientist mixes water (containing no salt) with a solution that contains 35 % salt. she wants to obtain 210 ounces of a mixture that is 30 % salt. how many ounces of water and how many ounces of the 35 % salt solution should she use?

she played for 18.75 hours.

step-by-step explanation:

if she played 2/4 of a hour on tuesday. and there is 60 minutes in an hour and 60 divided by 4 is 7.5. and she played 2/4 of an hour on thursday then again 60 divided by 4 is 7.5, you add 7.5+7.5=56.25. now you have to do 1/4 of an hour, it equals 3.75. now you have to add them all up. 3.75+7.5+7.5=18.75

i hope this and i hope you get it right. it took me a while to get this done for you. : )

the first one is x^2+2x+2

the second one is x^2+4

the last one is x^2-4x+8

the first option is the answer.

-8/2y-8=5/y+4-7y+8/y^2-16

we move all terms to the left:

-8/2y-8-(5/y+4-7y+8/y^2-16)=0

we can not solve this equation