If (x+2)^2 = (x-5)^2, what is the value of x^2-1

Which of the following always exist between two objects having mass ● elastic force ● contact force ●gravitational force ●magnetic force

Rick is on a bicycle trip. every 4 days he bikes 230 km. if rick keeps this same pace for 16 days, how many kilometers will he bike?

Consider a normal distribution of frog weights with u = 500 grams and o = 65 grams. a sample of size 2,000 is drawn from this population. approximately how many of the 2,000 cases would you expect to find between 435 and 565?