Simplify Exponents and Roots

Will give brainliestbased on the topographic map of mt. st. helens, what is the contour interval if the volcano height is 2,950 m?

X^2/100+y^2/25=1 the length of the major axis is: a)5 b)10 c)20

Anumber is equal to twice a smaller number plus 3. the same number is equal to twuce the sum of the smaller number and 1. how many solutions are possible for this situation