18. What is the change in temperature between -20°F and 30°F? (1 point)
10 deg °F
50 deg °F
-10 °F
- 50 deg °F
The change in temperature between -20°F and 30°F is 50°F.
19. The temperature was -5°F this morning. If the temperature dropped 8°F, what is the temperature now?
(1 point)
3 °F
-13 °F
13 °F
-3 °F
The temperature now, after a drop of 8°F from -5°F, is -13°F.
21. John threw a rock into a lake from a bridge 124 feet above the river's surface. The rock sinks 81 feet below the river's surface. What is the distance between the elevations? (Hint: Draw a picture or use a number line.) (1 point)
The distance between the elevations is the sum of the distance above the river's surface and the distance below the river's surface.
Distance above the river's surface: 124 feet
Distance below the river's surface: 81 feet
Therefore, the distance between the elevations is 124 + 81 = 205 feet.
48 / ((2 + 6) * 2) - 1 =
Hint: Use the order of operations (PEMDAS).
(1 point)
-12
2
3.2
11
To solve this expression, we can follow the order of operations (PEMDAS) which states that we should perform operations inside parentheses first, then exponents, then multiplication and division from left to right, and finally addition and subtraction from left to right.
Applying the order of operations to the expression:
48 / ((2 + 6) * 2) - 1
= 48 / (8 * 2) - 1 [Inside parentheses: 2 + 6 = 8]
= 48 / 16 - 1 [Multiplication: 8 * 2 = 16]
= 3 - 1 [Division: 48 / 16 = 3]
= 2 [Subtraction: 3 - 1 = 2]
Therefore, the expression simplifies to 2.