Answer:
Sandy will finish the race first.
Step-by-step explanation:
Let D be the total one sided distance in miles, ( between X and Y ),
We know that,
Since, from point X to point Y and back, Jack averages 30 miles per hour to point Y and 10 miles per hour back to point X.
So, the total time taken by Jack = 
Also, Sandy averages 20 miles per hour in both directions,
So, the total time taken by Sandy = 
∵ 0.133D > 0.10D
Hence, Sandy will finish the race first.
Answer:
b
c
40
Step-by-step explanation:
I have already had this question before.
Answer:
220
Step-by-step explanation:
Answer:
Variables in Mathematical Expressions. In algebra, we begin to see variables, or letters that are used to represent numbers. An example of a mathematical expression with a variable is 2x + 3. All variables must have a coefficient, a number that is multiplied by the variable. Please give me the brainliest answer?
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Isoceles triangles have one pair of congruent base angles opposite their congruent sides. Also, the angles in a triangle add up to 180°. Therefore, we can set up this equation:
100 + x + x = 180
(we know it's not the 100° angle that has a congruent match because that would cause the total angle measure to go above 180°)
100 + 2x = 180
Subtract 100 from each side.
2x = 80
Divide by 2.
x = 40°
Both of the other angles would be 40°.
