Answer:
a=60
Step-by-step explanation:
Answer : p(x)= x^2 -x+1
*Mark brainliest*
Answer:
if you mean x times 2 equals nine then false if you mean x to the power of two then true.
Step-by-step explanation:
Answer:
Number of bulbs which can be lit using 1 kg of coal = 9
Step-by-step explanation:
Energy yielded by burning 1 kg of coal = 30 × 106 joules
= 3180 joules
Amount of energy that can be used for electricity = 30 % of 3180 joules
= 0.30 × 3180
= 954 joules
Energy needed for lighting one bulb = Wattage of bulb × No. of hours of lighting
⇒ Energy needed for lighting one bulb = 100 × 1
= 100 joules

Hence, Number of bulbs which can be lit using 1 kg of coal = 9
The answer is 1/5
I hope this helps.
Have a awesome day. :)