You and your friend go to a taco truck for lunch. You order 3 soft tacos and 3 burritos and spend $11.25. Your friend orders 4 soft tacos and 2 burritos and spends $10.00.

See explanation

Step-by-step explanation:

Let soft tacos be x

Let burritos be y

3x + 3y = 11.25 i

4x + 2y = 10.00 ii

Multiply equation I by 4

Multiply equation ii by 3

12x + 12y = 45 iii

12x + 6y = 30 iv

Subtract iv from iii

6y = 15

y = 15/6 = 2.5

A burrito cost $2.50

Since 3x + 3y = 11.25 .

3x + 3(2.50) = 11.25

3x + 7.50 = 11.25

3x = 11.25 - 7.50

3x = 3.75.

x = 3.75/3

x = $1.25

A soft tacos is $1.25

step-by-step explanation: a reaction is first order. if the initial reactant concentration is 0.0200 m, and 25.0 days later the concentration is 6.25 x 10-4 m, then its half-life is:

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