niyah2224

17.12.2020 • 

Mathematics

Robyn makes and sells homemade bracelets she made $87.25 last week this week she donated some bracelets to charity so her profit at the end of this week can be represented by -$12.50 Part A: write a subtraction and addition expression to represent Robyns total profit for the two weeks combined

Part B: write an expression for the difference between last week profit and this weeks profit. What is the difference in dollars between last weeks profit and this weeks profit


Giving Brainliest to the first (Correct) answer!!!

Ответ:

keithlavender123

03.09.2022

Mathematics

---

y = (1/60) x² - (7/20) x + 49/30

Step-by-step explanation:

equation formula:    y = ax² + bx + c

pass (-1,2) (2,1) (7,0)

(-1,2):  a - b + c = 2   ... (1)

(2,1):   4a + 2b + c = 1   ... (2)

(7,0):   49a + 7b + c = 0   ... (3)

(2)-(1):  3a + 3b = -1   ... (4)

(3)-(2):  45a + 5b = -1   ... (5)

(4)*15-(5): 40b = -14         b = - 7/20   ... (6)

(4): 3a = -1 - 3*(-7/20) = 1/20        a = 1/60    ...(7)

(1): c = 2 - 1/60 + (-7/20) = 49/30        c =  49/30

equation:  y = (1/60) x² - (7/20) x + 49/30

---

0,0(0 оценок)