Calcule as expressões: a) - 10 - ( - 7 + 4 - 6 ) b) - 14 - ( 7 - 6 ) + ( 8 - 5 ) c) 10 - { - 2 + [ 1 + ( + 4 ) - 8 ] } d) 25 + [ - 4 + 1 - ( - 3 + 7 ) ] e) 21 + [ - 17 + ( 19 - 4 ) + 12 ]

Lin is writing an equation to model the proportional relationship between y, the total cost in dollars of downloading videos from a website, and x, the number of videos downloaded. she knows that the total cost to download 3 videos was $12. her work to find the equation is shown below. joylin’s work step 1 k= 3/12= 0.25 step 2 y= 0.25x where did joylin make her first error?

Find the solution of each of the following.

$30 to spend on dinner tax and gratuity at mos restaurant rax is 6% and they give a 15% tip on the total bill after taxes thier dinner cost $21 which statement correctly explains wether andrew and kate have enough money to pay their bill