D = distance
d^2 = x^2 + y^2
dd' = 2xx' + 2yy' Taking the derivative wrt time
d' = (2xx' + 2yy')/d
d' = (42x21 +56x28)/70 = 35 mph
For 1 you need 4 triangles the same size and for 2 you need to long triangles abs a different one
3-18
4-24
5-30
6-36
Rule-times 2
Answer:
A. An Algebraic Expression
Step-by-step explanation:
Since we have no equal sign in the problem, we know that it is an expression. An equation has an equal sign and another value so we can simplify to find the value of whatever variable we are working with. We also know that it is not anything numerical because we are working with variables. With this information we will see that the correct answer is A.
Best of Luck!