Please help i have no idea what im doing!

x represents hours of babysitting

y represents hours of music lesson

hours on babysitting: 11

hours on music lessons: 7

Step-by-step explanation:

x+y=18

5x+12y=139

-5(x+y=18)

=-5x-5y=-90

(5x+12y=139) + (-5x-5y=-90)

7y=49

y=7

x+7=18

x=11

last option: rhombus or kite

step-by-step explanation:

a kite and rhombus have the same shape. as we don't have any specific formula for the calculation of area of kite. the diagonals are used to calculate the area of a kite or rhombus.

the formula for area of rhombus is given by:

here, d_1 is the first diagonal and d_2 is the second diagonal.

so,

last option is the correct answer ..