Answer:
The length of the diameter is 18 cm
Step-by-step explanation:
In this question, we are asked to calculate the diameter of a right cylinder, given that the radius and the height are equal and given the value of the surface area.
Mathematically, the surface area of a cylinder can be represented by the equation;
A = 2 π r( r + h)
since r = h, we can say h = r
Thus, the equation becomes;
A = 2 π r( r + r)
A = 2 π r(2r)
A = 4 π r^2
From the question, we can see that the value of A = 324 π
substituting this, we have;
324 π = 4 π r^2
4r^2 = 324
r^2 = 324/4
r^2 = 81
r = root of 81
r = 9 cm
The value of the diameter is two times the radius
Hence D = 2r = 2 * 9 = 18 cm
Answer:
5.625¢
Step-by-step explanation:
The amount of energy used by the chandelier is ...
5 × 0.075 kW × 1.5 h = 0.5625 kWh
At 10¢ per kWh, the cost will be ...
0.5625 kWh × 10¢/kWh = 5.625¢ . . . . cost of operation for 90 minutes
9.4/10 is the simplest form
Babysitting for 8 hours and making $72.00 because of a better/greater amount of money
C is your answer e cause u supposed to multiple
