(lots of points and brainliest)Identify which equations have one solution, infinitely many solutions, or no solution. 1/2y +3.2y=20
15/2+2z-1/4=4z+29/4-2z
3z+2.5=3.2+3z
1.1+3/4x+2=3.1+3/4x
4.5r=3.2+4.5r
2x+4=3x+1/2

Marco has $38.43 dollars in his checking account. his checking account is linked to his amazon music account so he can buy music. the songs he purchases cost $1.29. part 1: write an expression to describe the amount of money in his checking account in relationship to the number of songs he purchases. part 2: describe what the variable represents in this situation.

Which of the following tables represents exponential functions?

Ageologist had two rocks on a scale that weighed 4.6 kilograms together. rock a was 0.5 of the total weight. how much did rock a weigh?