It is a chilly January day. When you get up it is only 5°F outside. By noon, the temperature had risen 7°F. By 10pm, it had dropped 15°F. What is the temperature outside when you go to bed at 10pm?

-3

Step-by-step explanation:

its just adding and subtracting

-2ºf

Step-by-step explanation:

the temp is 5ºf outside in the morning, then it went up 7ºf more, so 5+7= 13

after that, you would then do 13-15 which would be -2

so by 10pm it would be -2ºf

reduce the friction between its moving parts

step-by-step explanation:

in fact, by reducing the friction between the moving parts of the machine, it is possible to reduce the energy wasted due to this friction; therefore, more input energy is converted into useful work, and this will improve the efficiency of the machine.

the answer is:

the answer is:

to solve the problem, we need to remember the quotient of power property, it's defined by the following relation:

if we have a quotienf of powers that have the same base, we need to keep the same base and subtract the exponent of the denominator power to the exponent of the numerator power.

so, we are given the expression:

then, calculating we have:

hence, the answer is:

have a nice day!