41. Suppose you have 45 poker chips with $5 and $25 values. The total value of chips is $465. If x is the number of $5 chips and y is the number of $25 chips, then the following system of equations represents this situation: x + y = 45 5x + 25y = 465 Solve this system by graphing each equation. y 20 40 60 80 100

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:

-13

step-by-step explanation:

f(x)=2x-5 for f(-4)

f(-4)   means let x=-4

f(-4) = 2(-4) -5

f(-4) =-8-5

      = -13

9 sandwiches per hour

step-by-step explanation:

when we have a rate, we want a 1 in the denominator

27/3 = 9

27 sandwiches/ 3 hours = 9 sandwiches/hour