Answer:
Total minutes = 47 Minutes
Step-by-step explanation:
A telephone company in germany charges 0.12 euro per minute to call the US after a connection fee of 1.50 euro
Expressing the statement in mathematical terms;
Cost = 0.12x + 1.5 where x represens minutes
if the cost of the call was 7.14 euro, total minutes = ?
7.14 = 0.12x + 1.5
7.14 - 1.5 = 0.12x
5.64 = 0.12x
x = 5.64 / 0.12 = 47
Total minutes = 47 Minutes
Answer:
4
Step-by-step explanation:
This situation has two unknowns - the total number of half dollars and the total number of quarters. Because we have two unknowns, we will write a system of equations with two equations using the two unknowns.
- h+q=31 is an equation representing the total number of coins
- 0.50h+0.25q=11 is an equation representing the total value in money based on the number of coin. 0.50 and 0.25 come from the value of a half dollar and quarter individually.
We write the first equation in terms of q by subtracting it across the equal sign to get h=31-q. We now substitute this for h in the second equation.
0.50(31-q)+0.25q=11
15.5-0.50q+0.25q=11
15.5-0.25q=11
After simplifying, we subtract 15.5 across and divide by the coefficient of q.
-0.25q=-4.5
q=4
We now know of the 31 coins that 4 are quarters.
Regardless of the sign of
, we have
(never negative). But multiplying by -1 makes it negative.
On the other hand,
which can never be negative for real
.
Answer:
false
Step-by-step explanation:
