Answer:
250(1+.04)^3
Step-by-step explanation:
Answer:
(6, 44)
General Formulas and Concepts:
<u>Pre-Algebra</u>
Order of Operations: BPEMDAS
- Brackets
- Parenthesis
- Exponents
- Multiplication
- Division
- Addition
- Subtraction
Equality Properties
<u>Algebra I</u>
- Solving systems of equations using substitution/elimination
Step-by-step explanation:
<u>Step 1: Define Systems</u>
y = 4x + 20
y = 8x - 4
<u>Step 2: Solve for </u><em><u>x</u></em>
<em>Substitution</em>
- Substitute in <em>y</em>: 8x - 4 = 4x + 20
- Subtract 4x on both sides: 4x - 4 = 20
- Add 4 on both sides: 4x = 24
- Divide 4 on both sides: x = 6
<u>Step 3: Solve for </u><em><u>y</u></em>
- Define equation: y = 8x - 4
- Substitute in <em>x</em>: y = 8(6) - 4
- Multiply: y = 48 - 4
- Subtract: y = 44
Answer:
74°F
Step-by-step explanation:
In order to find the average of a certain amount of numbers, you add those numbers together and divide by how many numbers there are. In this case, you would reverse that method to find the last number. We know that there were four readings, and we have three of them and the average. Multiply the average (84.75) by the number of readings (4), and you get the sum of all the readings (339). Then you subtract each of the readings that you already know to isolate the last reading. 339 - 112 (first reading) = 227, 227 - 68 (second reading) = 159, and 159 - 85 (fourth reading) = 74. Therefore, the third reading must be 74.
