10x-4 + 8x+3 + 91 = 180
18x + 90 = 180
18x = 180 - 90
18x = 90
x = 90/18
x = 5
4 [ 5 (12 + 3) - 2 ] - 7
4 [ 5 (15) - 2 ] - 7
4 [ 75 - 2 ] - 7
4 [ 73 ] - 7
292 - 7
285
Answer:
y= (0)x + 5
Step-by-step explanation:
Answer:
Net power = 20kW
B.) $128
Step-by-step explanation:
Given that :
Coefficient of performance = 2.5
Rate = 20kW
The net power required to operate the heat pump :
Energy delivery rate / Coefficient of performance
= 20kW / 2.5
= 8kW
B.) Given that electricity cost equals $0.08 per kW
If pump operates for 200 hours
Total energy used in kWhr :
8kW * 200= 1600kW
Cost per kW = $0.08
1600 * 0.08 = $128
