1. what is the sum of 7 x 10^-8 and 6 x 10^-8?

Question

o 13 x 10^8
o 1.3 x 10^-7
o 13 x 10^-16

2. the amazon river releases 5.5 gallons of water into the Atlantic ocean every second. there are about 3.2 x 10^7 seconds in a year. how many gallons are released into the ocean in one year? express your answer with the appropriate number of significant digits.

3. calculate and value the expression 35 ÷ 5 x 7 - 2^3

o -7
o -1
o 7
o 41

Answer 1

1. The sum of 7 x 10^-8 and 6 x 10^-8 is 13 x 10^-8.

2. To find the number of gallons released into the ocean in one year, multiply the number of gallons released per second (5.5) by the number of seconds in a year (3.2 x 10^7):

5.5 gallons/second * 3.2 x 10^7 seconds/year = 17.6 x 10^7 gallons/year

Since the question asks for the answer with the appropriate number of significant digits, the answer would be 18 x 10^7 gallons/year (rounded to one significant digit).

3. To calculate the expression 35 ÷ 5 x 7 - 2^3, follow the order of operations:

35 ÷ 5 = 7
7 x 7 = 49
2^3 = 8
49 - 8 = 41

Therefore, the value of the expression is 41.

Answer 2

the first question and the answer that you gave isn't one of the options

Answer 3

Apologies for the confusion. Let's reevaluate the first question:

1. The sum of 7 x 10^-8 and 6 x 10^-8 is (7 + 6) x 10^-8 = 13 x 10^-8.

Therefore, the correct answer is 13 x 10^-8, which matches option "o 13 x 10^-8".

Answer 4

huh?? the only options are
o 13 x 10^8
o 1.3 x 10^-7
o 13 x 10^-16

Answer 5

Apologies for the oversight. Let's reevaluate the first question with the given options:

1. The sum of 7 x 10^-8 and 6 x 10^-8 is (7 + 6) x 10^-8 = 13 x 10^-8.

Therefore, the correct answer is 13 x 10^-8, which matches option "o 13 x 10^-8".

Answer 6

so is the answer 13 x 10^8 or 1.3 x 10^-7

Answer 7

I apologize for the confusion. The correct answer is 1.3 x 10^-7, which matches option "o 1.3 x 10^-7".