Erica solved the equation −5x − 25 = 78; her work is shown below. identify the error and where it was made.
−5x − 25 = 78
step 1: −5x − 25 − 25 = 78 − 25
step 2: −5x = 53
step 3: negative five times x over negative five = fifty-three over negative five
step 4: x = negative fifty-three over five

Arianna is buying plants for her garden. she buys 15 flowering plants for $96. pink flowering plants sell for $8, and purple flowering plants sell for $5. how many pink flowering plants did arianna buy? i figured out the answer! the answer is 7. 8x +5y = 96 plug in 7 for x 8 (7) + 5y = 96 56 + 5y = 96 subtract 56 from both sides 5y/y = 40/5 y = 8 she bought 7 pink and 8 purple plants

Three times the sum of a number and seven is negative thirty-six. what is the number?

What is the inverse of the function f(x) = 2x + 1?