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where can i find a website that helps me understand and solve equations like x^2= -900?

where can i find help online about imaginary numbers? i do not understand them.

When 2-methyl-2-butene is bubbled into dilute sulfuric acid at room temperature, it appears to dissolve. What new substance has been formed?

All of the following search engines are meta-search engine with the exception of

for each person explain accurately two ways in which they communicate with others,a baby 9months,a child 9year old,a teenager 17year old,middle age 45year old and an elderly person 73year old

hasan has 18 3/4 yards of fabric. it takes 3 1/6 yards to make a pillowcase. hasan plans to make as many pillowcases as he can. how many yards of fabric will be left over

thank you

I got 20 mph.