Answer:
=25
Step-by-step explanation:
plug in the numbers for the variables
5(3)+2(5)
15+10
25
Answer:
The proposition is true.
Step-by-step explanation:
Now we proceed to demostrate that expression given is true by algebraic means:
1) 
Given
2) 
3) 
Distributive property/
4) 
Commutative, associative and modulative properties/Existence of additive inverse/
5) ![[(x\cdot y)^{-1}]^{-1}\cdot (x^{-2}+y^{-2})](https://tex.z-dn.net/?f=%5B%28x%5Ccdot%20y%29%5E%7B-1%7D%5D%5E%7B-1%7D%5Ccdot%20%28x%5E%7B-2%7D%2By%5E%7B-2%7D%29)
Commutative property/Definition of division
6) 
7) 
Distributive property/Associative property/
8) 
Modulative property/Existence of additive inverse/
9) 
Distributive property
10) 
11) 
Commutative property/Definition of division/Result
Answer:: D(t)= 50(4/5)^t
Step-by-step explanation: If 1/5 of the temperature difference is lost each minute, that means 4/5 of the difference remains each minute. So each minute, the temperature difference is multiplied by a factor of 4/5 (or 0.8).
If we start with the initial temperature difference, 50° Celsius, and keep multiplying by 4/5, this function gives us the temperature difference t minutes after the cake was put in the cooler.
Answer:
9900
Step-by-step explanation:
10 percent of 10k is 1000, so it went down to 9000 then went up by 900 because 10 percent of 9000 is 900
