To make it easier, lets say Justin = J, Eva = E, and Emma = M. Then, J = E + 7.50 M = J -12 J + E + M = 63 You can substitute for M in the third equation using the second equation, and you get: J + E + J - 12 = 63 Clean it up a little bit and you get: 2J + E = 75 You know J = E + 7.50, so substitute that for J and you get: 2(E + 7.50) + E = 75 2E + 15 + E = 75 3E + 15 = 75 3E = 60 E = 20 ; meaning that Eva has $20. Justin has $7.50 more than Eva, so he has $27.50. Emma has $12 less than Justin, so Emma has $15.50. Double check your answer by making sure they all add up to 63, which they do.
Answer:
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Answer:
5$??.
Step-by-step explanation:
If a magazine was 5$, 25-5= 20. So then, 20÷4= 5. There fore an eraser costs 5$.
Add up the amount of miles she actually reached to
2.4 + 3.1 =
5.5 = miles already traveled
And then subtract it from the 8 mile trail
8 - 5.5 =
2.5 miles
About 2.5 or 3 miles (rounded to the tenth or whole number?)
Answer:
a. 
b. 
Step-by-step explanation:
Given
<em>Direct Variation</em>
D = 264 cm when T = 11 s
Calculating (a)
First, the constant of variation (k) as to be calculated;
Since, there exist a direct proportion; then,
Make k the subject of formula
<em>D = 264 cm when T = 11 s; So</em>
<em />
<em />
<em />
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So: Solving for (a)
Substitute 408 for D and 24 for k in
Divide both sides by 24
<em>Hence, time to move a distance of 408cm is 17s</em>
Calculating (b)
Substitute 3 for T and 24 for k in
<em>Hence, distance covered in 3 seconds is 72cm</em>
