What two things are always true of a number written in scientific notation

A tree casts a shadow 9 meters long. at the same time, a building 54 meters tall casts a shadow 21 meters long. to the nearest meter, what is the height of the tree?

Which equation shows the result of substituting and expression for y from the first equation into the second equation for the given system? ly=x+5 ly-2x=2 (5 - X) - 2x = 2 (x + 5) - 2x = 2 (x + 5) + 2x = 2 (x + 5) - 2x = 0

If pg=50 and gr = 15, then what is the value of g (p+r)

In a function, every output value corresponds to exactly one input value true or false

Which expression is equivalent to six over fifteen? 6 : 15 15 : 6 6 - 15 15 - 6

the width of a rectangle is 5 inches less than its length, and the area is 14 square inches. What are the length and width of the rectangle?

Are these correct steps for solving 9x^2=108

Write the expression as a single natural logarithm. 3 ln 3 + 4 ln b ln 96b4 ln (27 + b4) ln 36b ln 27b4

Ralph sold brownies for $ 0.63 0.63 a piece in order to earn money to buy baseball cards. If the cards cost $ 1.35 1.35 per pack, and if Ralph had no money left over after buying them, what is the least number of brownies he must have sold?

The segments shown below could form a triangle 9,4,15 true or false