Answer: 450 cm³ is the volume
Step-by-step explanation:
Volume of pyramid = L x W x H divide by 3
How do I solve 8/3=(y-9)/(7y+4)
1 answer:
Equation
Cross Multiply
Solve
8 * (7y + 4) = 3*(y - 9) Remove the brackets
56y + 32 = 3y - 27 Subtract 3y from both sides.
56y - 3y + 32 = - 27
53y + 32 = -27 Subtract 32 from both sides.
53y = -32 - 27
53y = - 59 Divide by 53
y = - 59/53
y = - 1.113
Check
8/3 = (-1.113 - 9)/(7*-1.113 + 4)
8/3 = -10.113 / (- 7.791 + 4 )
8/3 = -10.113 / -3.791
8/3 = 2.667 which very nearly right. Some rounding has taken place.
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Answer: Raymond is correct
The DJ charges $75 an hour.
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Explanation:
x = number of hours
y = total cost
The DJ does a 3-hour event for $275. This means one point is (x,y) = (3,275)
Another point is (5,425) because a 5-hour event costs $425.
Let's find the slope of the line through these two points.
The slope is 75, meaning that each time y goes up by 75, x goes up by 1.
Flipped around it means each time x goes up by 1, y goes up by 75.
This means each time we add on an extra hour, the cost goes up by $75.
The DJ charges $75 an hour. Raymond is correct.