The cost of peanut varies directly with the number of pounds but. if 3 pounds of peanuts cost $6.30, what is the cost of 4.5 pounds

If a and b are the measures of two first quadrant angles and sin a = 4/9 and sin b = 2/5 find sin(a+b).

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.

Ill mark the brainliest if you me with the these three questions 7,8,9