Which of the following is the conjugate of a complex number with –4 as the real part and 2i as the imaginary part?

2i – 4
2i + 4
–4 – 2i
4 – 2i

Olive's solar powered scooter travels at a rate of 30 miles per hour. what equation can she use to calculate her distance with relation to the time she traveled? h=hours m=miles 1. h=m+30 2. m=30h 3. m=h+30 4. h=30m