the electric current I (in amperes) produced by an alternator in time t (in seconds) is given by I=60sin(120pit). find the smallest possible positive value of t such that a. I=30 amperes and b. I=-10 amperes

Find the x-intercept and y-intercept of the line. 3x + 5y = −15

Amerchant has coffee worth $60 a pound that she wishes to mix with 50 pounds of coffee worth $90 a pound to get a mixture that she will sell for $70 a pound. how many pounds of the & 60 coffee should be used?

Which statements about the system are true? check all that apply. y =1/3 x – 4 3y – x = –7 the system has one solution. the system consists of parallel lines. both lines have the same slope. both lines have the same y–intercept. the equations represent the same line. the lines intersect.