PLEASE HELP ME WITH THESE TWO 9TH GRADE MATH QUESTIONS!

1) What is the common ratio of the geometric sequence: -1/12,-1/2,-3,-18,...

A-1/6
B-6
C1/6
D6

2) In the first hour of an experiment, the temperature of a liquid was 4.5°C. Then the temperature was raised by 0.25°C every hour after that.

In what hour was the temperature of the liquid equal to 22.25°C?

AHour 69
BHour 70
CHour 71
DHour 72

Question

13-01-2015
Mathematics

Answered

PLEASE HELP ME WITH THESE TWO 9TH GRADE MATH QUESTIONS!

1) What is the common ratio of the geometric sequence: -1/12,-1/2,-3,-18,...

A-1/6
B-6
C1/6
D6

2) In the first hour of an experiment, the temperature of a liquid was 4.5°C. Then the temperature was raised by 0.25°C every hour after that.

In what hour was the temperature of the liquid equal to 22.25°C?

AHour 69
BHour 70
CHour 71
DHour 72

Verified Answer :

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lordhorox1031 lordhorox1031 · Answer 1 · 2015-01-13T17:55:24-05:00

lordhorox1031 lordhorox1031

13-01-2015

The first one is D because it's being multiplied by 6 each time. The pattern of negative and positive numbers doesn't occur so any negative numbers are taken out and if it was multiplied by 1/6 the denominator would be getting larger each time it was multiplied.

The second one is C, 71 multiplied by .25 equals 17.75. Which is the difference between 22.25 and 4.5.

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