400% of what number is 150?

Kayla wants to find the width, ab, of a river. she walks along the edge of the river 65 ft and marks point c. then she walks 25 ft further and marks point d. she turns 90° and walks until her location, point a, and point c are collinear. she marks point e at this location, as shown. (a) can kayla conclude that δ and δ are similar? why or why not? (b) suppose de = 15 ft. what can kayla conclude about the width of the river?

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?

0if x and y vary inversely and y=6 as x=7, what is the constant of variation?