Jennifer and Callie are training for a marathon. Jennifer has run m miles, and Callie has run 3 times as many as Jennifer. The expression shows how many miles they have run altogether. The expression: m+3m

a. M+4
b. m+3
c.4m
d.4m^2

Express the following as a function of a single angle, cos(60) cos(-20) - sin(60) sin(-20)

You and a friend race across a field to a fence and back. your friend has a 50-meter head start. the equations shown represent you and your friend's distances dd (in meters) from the fence tt seconds after the race begins. find the time at which you catch up to your friend. you: d=∣−5t+100∣d=∣−5t+100∣ your friend: d=∣−313t+50∣∣

Factor -8x3-2x2-12x-3 by grouping what is the resulting expression?