25 quarters because if you set up a system of equations you get x+y=30 since there are x number of half dollars and y number of quarters plus each other is 30. Next equation is .5x+.25y=8.75 half dollar is 50cents while a quarter equals 25 cents and together they have to equal 8.75. Now you eliminate one variable then you add the remaining variable and the amounts together then you divide if you eliminated the x variable your answer is the one you get after you divide. If you eliminate the y variable then you have to plug it then you get your answer. hope this helped
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Answer:
864
Step-by-step explanation:
since the volume is 1728, the cube root of 1728 is the length of each side, which is 12. to find surface area of a cube, we find the area of one face and multiply it by 6. 12*12*6 = 864.
Answer:
<u>Initial</u><u> </u><u>speed</u><u> </u><u>is</u><u> </u><u>3</u><u>2</u><u> </u><u>m</u><u>/</u><u>s</u>
At uniform speed, acceleration is 0, (a = 0).
When speed reduced, (v - u) = 2.78 ms-¹, t = 1800 sec, s = 60 ,000 metres.
From first equation of motion:

substitute:

from second equation of motion:

substitute:

Answer:
the red dot is the given point.
Step-by-step explanation:
Answer:

b. 20 seconds
Step-by-step explanation:
Let
be the distance in miles and
be the time in seconds and
be the speed in miles/sec
Formula for Distance is given as:

Given that:
Distance = 2 miles and
Time = 10 seconds
Putting the values in formula:

<em>Answer a:</em>
Putting the value of
back in the formula to find the <em>direct variation equation </em>for the relationship between time and distance:

<em>Answer b:</em>
Using the above formula and putting
:
