Which of the following expressions is written in scientific notation? (math)

Peaches cost $4.29 per pound. find the cost of two and a quarter pounds of peaches.

What is the vertex form of f(x) = x2 + 6x + 3

In each of the cases that follow, the magnitude of a vector is given along with the counterclockwise angle it makes with the +x axis. use trigonometry to find the x and y components of the vector. also, sketch each vector approximately to scale to see if your calculated answers seem reasonable. (a) 50.0 n at 60.0°, (b) 75 m/ s at 5π/ 6 rad, (c) 254 lb at 325°, (d) 69 km at 1.1π rad.