Balance
-9k = 63 What is the value of k?
k = -7
The temperature was -12 degrees at 8 am. The temperature got warmer by 3 degrees per hour. What was the temperature at 1 p.m.?
-12 + 3(5) = -12 + 15 = 3 degrees at 1 p.m.
The starting elevation was -200 ft. The change in elevation was 230 ft. up. Write an addition equation to represent the situation and solve.
-200 + 230 = +30 ft.
Sally has a balance of $12. She makes a withdrawal of $45. What is her new balance?
-33
-5 times -12 equals?
Positive 60
11 - n = 33 Solve for n.
n = -22
Lake temperature was 32 degrees at noon. Temperature had risen at a constant rate of 4 degrees per hour. What was the temperature at 6 a.m.?
32 - 4(6) = 8 degrees.
A mountaineer started at 400 ft. Her final elevation was -750 ft. What was the change in elevation?
400 + n = -750. n = -1150
What would a negative ending balance in an account represent?
debt
|8.3| + |-8.3| equals zero. True or False
False
1/5y = 20 Solve for y.
y = 100
The temperature is -4 Celsius. The temperature decreases by 15 degrees. What is the new temperature?
-4 + -15 = -19
What is the sum of a number and its opposite?
zero
Would a withdrawal have a positive or negative impact on an account?
negative
A shark is swimming 10 feet below sea level then swims to 3 feet below sea level. What is its change in depth?
7 feet
18 = m + 1.5 Solve for m.
m = 16.5
At midnight, the temperature was -8 degrees. At, 7 a.m. the temperature was 9 degrees. By how much did the temperature change?
+17
What sign will the answer be if two addends have opposite signs, and the number with the larger magnitude is negative?
negative
An account balance is $-67. A deposit of $73 is made. What is the new balance?
$6
On Monday, 1/5 of the enrolled students were absent. There were 3600 students present. How many students are enrolled at the school?
4500
-3y + 7 = 49 Solve for y.
y = -14
The temperature was 38 degrees Celsius at 8 p.m. The temperature dropped 2 degrees per hour. What was the temperature at 4 a.m.?
22 degrees
What do we call two numbers that have the same relationship to zero? (i.e. 3 and -3)
opposites
Explorer club needs $172 to cover expenses for a trip. The club sold 64 candy bars at $2.50 each. Did they make enough money to pay for the trip?
No. Only made $160.
A store buys sweaters for $10 and sells them for $25. How many sweaters does the store need to sell to make a profit of $450?
30 sweaters