Yumi spent $34.15 buying stamps. The number of 56-cent stamps she bought was 10 less than 4 times the number of 41-cent stamps. How many of each did she buy?

Solution:

Let "a" be the number of 56 cent stamps

Let "b" be the number of 41 cent stamps

The number of 56-cent stamps she bought was 10 less than 4 times the number of 41-cent stamps

number of 56-cent stamps = 4 times the number of 41-cent stamps - 10

a = 4b - 10 -------- eqn 1

Yumi spent $34.15 buying stamps

Therefore,

56a + 41b = 3415 ------- eqn 2

Substitute eqn 1 in eqn 2

56(4b - 10) + 41b = 3415

224b - 560 + 41b = 3415

265b = 3975

Substitute b = 15 in eqn 1

a = 4(15) - 10

a = 60 - 10

Thus number of 56 cent stamps is 50 and number of 41 cent stamps is 15

irrational, then, just means all the numbers that aren't rational. every integer is a rational number, since each integer n can be written in the form n/1. however, numbers like 1/2, 45454737/2424242, and -3/7 are also rational, since they are fractions whose numerator and denominator are integers.

step-by-step explanation:

you estimate that the angle of elevation to the top of the 86th floor (the observatory) is 82 .the total height of the building is another 123 meters above the 86th floor.

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