The admission fee at fun city is $5 for kids and $9 for adults. On a certain day 420 people enter the park and the admission fees collected totalled $2780. Determine the. Umber of adults and the number of kids who entered the park that day.

How do i do this activity, is appreciated

Answer asap ill give ! ’ a sample of radioactive material decays over time. the number of grams, y , of the material remaining x days after the sample is discovered is given by the equation y = 10(0.5)^x. what does the number 10 represents in the equation? a. the half-life of the radioactive material, in days b. the amount of the sample, in grams, that decays each day c. the time, in days, it will take for the samples to decay completely d. the size of the sample, in grams, at the time the material was discovered

X+y=-4 x-y=2 use elimination with adding and subtraction