13 miles/ (3 1/4 hours)= 4 miles/hour.
Her average rate is 4 miles/hour~
Answer:
<em><u>hope</u></em><em><u> </u></em><em><u>it</u></em><em><u> </u></em><em><u>is</u></em><em><u> </u></em><em><u>helpful</u></em><em><u> </u></em><em><u>to</u></em><em><u> </u></em><em><u>you</u></em><em><u> </u></em>
Step-by-step explanation:
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Answer:
Value of x = 400
Step-by-step explanation:
Joint variation states that describes a situation where a variable depends on two (or more) other variables, and varies directly with some of them.
Given: x varies directly with y and z.
i.e
and 
then we have the joint variation as;
......[1] where k is the constant variation.
Substitute the value of x =1200 when y =20 and z = 30 to solve for k;

Simplify:

Divide both sides by 600 we get;

Now, substitute k =2 , y =10 and z = 20 to find x;
Using [1] we have;

Therefore, the value of x is, 400
Answer:
99
Step-by-step explanation: