Answer:

Step-by-step explanation:
we know that
She rides for 11.2 kilometers at a speed of 7 kilometers per hour
Using proportion
Find how many hours does she ride

Answer:
616/22 = 28
784/28 = 28
Step-by-step explanation:
Number 4 is 66
Number 5 Iseconds 5.32
Answer:
B
Step-by-step explanation:
This looks like scalar matrix multiplication. The idea here is to multiply the scalar 3 by each item inside the matrix.
Doing so leads to the answer [3 -12 15 -21]
Side note: I'm assuming the matrix given to you has 1 row and 4 columns.