Answer: 37.7
Step-by-step explanation:
10 % of 40 = 10/100 ×40=4
When dropped by 10% then amount on Monday = 40-4=36
On tuesday price dropped = 36 - 10 = 26
Increased by 45% on friday : 45/100 × 26 + 26 =
37.7
Answer:
D. undefined
General Formulas and Concepts:
<u>Calculus</u>
Derivatives
Derivative Notation
Derivative of a constant is 0
Basic Power Rule:
- f(x) = cxⁿ
- f’(x) = c·nxⁿ⁻¹
Derivative Rule [Chain Rule]:
Trig Derivative:
Derivatives of Parametrics:
Step-by-step explanation:
<u>Step 1: Define</u>
<u>Step 2: Differentiate</u>
- [x Derivative] Basic Power Rule:
- [y Derivative] Trig Derivative [Chain Rule]:
- [y Derivative] Basic Power Rule:
- [y Derivative] Simplify:
- [Derivative] Rewrite:
Anything divided by 0 is undefined.
Topic: AP Calculus BC (Calculus I/II)
Unit: Differentiation with Parametrics
Book: College Calculus 10e
21 the number is 21 the number of 1 is 21
Answer:
yes, the account is overdrawn
Step-by-step explanation:
The first cheque for £256 is more than the account balance of £145. The account is overdrawn by considerably more than £50.
Answer: (x,y) = (6,-3)
This means 6 goes in the first blank and -3 goes in the second blank.
=========================================================
Explanation:
Solve the second equation for x
x+8y = -18
x = -18-8y
We'll plug that into the first equation and isolate y. This is where substitution comes in.
5x + 7y = 9
5( x ) + 7y = 9
5( -18-8y ) + 7y = 9 ... replace x with -18-8y
-90-40y + 7y = 9
-90-33y = 9
-33y = 9+90
-33y = 99
y = 99/(-33)
y = -3
Use this y value to find x
x = -18-8y
x = -18-8(-3)
x = -18+24
x = 6
The solution is (x,y) = (6,-3)
----------------------
Checking the answer:
Let's check the first equation
5x+7y = 9
5(6)+7(-3) = 9 ... plug in (x,y) = (6,-3)
30-21 = 9
9 = 9 .... true equation
Do the same for the second equation as well
x+8y = -18
6 + 8(-3) = -18
6 - 24 = -18
-18 = -18 .... also true
Both equations are true when we plug in (x,y) = (6,-3), so the solution is confirmed.