Question

1. what is the value of 668 + 575 + 453, rounded to the nearest hundred?

a. 1,100
b. 1,200
c. 1,500
d. 1,600
e. 1,700

1. an object placed in a super - cooling freezer cools from 33°f to - 18°f. by how many degrees fahrenheit has it cooled?

f. 18°f
g. 15°f
h. 33°f
j. 51°f
k. 52°f

1. at 4:00 a.m., the temperature is - 17°f. the temperature decreases 3°f per hour. what is the temperature at 6:00 a.m.?

a. - 23°f
b. - 20°f
c. - 17°f
d. - 14°f
e. - 11°f

Explanation:

Step1: Sum first two numbers

$668 + 575 = 1243$

Step2: Add third number to total

$1243 + 453 = 1696$

Step3: Round to nearest hundred

$1696 \approx 1700$

Step1: Calculate temperature change

$33 - (-18) = 33 + 18 = 51$

Step1: Find hours elapsed

$6 - 4 = 2$ hours

Step2: Calculate total temp drop

$2 \times 3 = 6^\circ\text{F}$

Step3: Compute final temperature

$-17 - 6 = -23^\circ\text{F}$

Answer:

1. E. 1,700
2. J. $51^\circ\text{F}$
3. A. $-23^\circ\text{F}$