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Alg 1
What are the approximate solutions of 2x^2 x + 10 = 0 In working this, I came up with a negative (79) under the radical sign. Can I take the sq rt of a negative? my choices are: 2, 2.5 1.97, 2.47 2.5, 2 No solution I think it

algebra
what is the value of c so that x^211x+c makes a perfect trinomial A. 121 B.121 over 4 C.11/2 D.121/2 i think it is B

Geometry
The area of a square is 121 sq feet. What is the length of its sides? Would I find this by dividing 121 by 4?

math
estimate 58% of 121 by using 10%. show your work. thanks so much

Are these correct?
A) How do you make 200 mL of a 0.1 M solution of a substance that has a molecular weight of 121.1 g/mol? Answer I got: 200mL = 1/0.1M x 1/(121.1g/mol) x mass of the substance. mass of the substance = 0.2L x 0.1M x 121.1g/mol=2.42g

Chemistry(Please check answers)
1) The standard molar entropy value of N2 (g) is 191.5 J/Kmol, of O2 (g) is 205.0 J/Kmol and of NO2 (g) is 240.0 J/Kmol. From these values we can calculate the Delta So for the reaction N2 (g) + 2 O2 (g)> 2 NO2 (g) to be? I

Algebra
A circle’s area is represented by A = π(x2 − 22x + 121). What expression represents the radius of the circle? A. x + 11 B. x − 11 C. x − 22 D. x + 22 I got B. please correct me if I am wrong/ Thank You sir

Biochemistry
How do you prepare 100 mL of a 0.1 M TRISHCl buffer with a pH 7.4 using solid TRIS base (MW 121.1) and 1 M hydrochloric acid? I started with pH=pKa + log ([Tris]/[Tris+] [Tris]/[Tris+]= 10^(7.48.06]=0.219 so 0.219:1 ratio with

Math
1) x^2 + 22x + k = (xr)^2 Given constants r and k, the above equation is true for all values of x. What is the value of the sum of r and k? I'm thinking it's 110, because to get 22x, r has to be 11, and that would mean k = 121.

Algebra
Add or subtract. Assume all variables represent nonnegative real numbers. 13√128 + 6√169  7√121  11√162

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What is the index of a radical? When working with radicals, can the radicand be negative when the index is odd? Can it be negative when the index is even? Why is it important to simplify radical expressions before adding or

math
A tower casts a shadow 11 feet long. The distance from the top of the tower to the end of the shadow is 61 feet. how many feet tall is the tower? 61Squared = 11squared = h squared 3721 = 121 + h squared 121 = 121 3600 = h
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