50 points i really don't understand these 4 problems**1. select the expressions that are equivalent to 5/6x^4. select all that applya.5x^-4/6b.6^-1x^-4/5^-1c.25/1 296d.30x2.if n x 10^p is a number written in scientific notation, which statements are true? select all that apply. a. n is a whole numberb.1< =n< 10c. p is positived. p can be positive, negative, or zero3. select the expression that is equivalent to 1.26 x 10^-3 -7.003x10^5a. -5.734 x 10^3b. 1,260 - 7,003,000c. 8.82378 x 10^18d. 0.001260 - 7,003,0004. select the expression that is equivalent to (8 x 10^5)(9 x 10^3) .a. (8+9)(10^5+10^3)b. 8 x 9 x 10^5+3c. 8 x 9 x 10^5 x 3d. (8+x)(10^5+10^3)