Answer:
Lin has 11 acorns ⇒ answer D
He subtract 4 from 7 instead of add 4 to 7
Step-by-step explanation:
- Lin has 4 pinecones and some acorns
- She has 7 fewer pinecones than acorns
- The meaning of 7 fewer pinecones than acorns is the number of the
pinecones is less than the number of acorns by 7
∵ She has 4 pinecones
∵ She has 7 fewer pinecones than acorns
- The number of pine cones is less than the number of acorns by 7
∴ 4 = number of acorns - 7
- Add 7 to both sides
∴ 11 = number of acorns
*<em> Lin has 11 acorns</em>
- Tom choose answer A which is 3
- He made a mistake in the equation
- He put ⇒ number of the acorns = 7 - 4 not 7 + 4
∴ number of acorns = 3
* <em>He subtract 4 from 7 instead of add 4 to 7</em>
Answer:
44x² + 110x + 66
Step-by-step explanation:
(11x + 11)(4x + 6)
Use F.O.I.L. to complete this
Firsts (multiply the first number in each set of parenthesis together)
Outsides (multiply the first number in the first set of parenthesis and the second number in the second set of parenthesis together)
Insides (multiply the second number in the first set of parenthesis and the first number in the second set of parenthesis together)
Lasts (multiply the second number in each set of parenthesis together)
Firsts: 11x(4x) = 44x²
Outsides: 11x(6) = 66x
Insides: 11(4x) = 44x
Lasts: 11(6) = 66
Now add them all together:
44x² + 66x + 44x + 66
44x² + 110x + 66
To answer the first problem, we determine first the equivalent z score and get the corresponding probability. The z score at 3 hours is (3-3.4)/0.5 = 0.8 while that of 4 hrs is <span>(4-3.4)/0.5 = 1.2. z score of 0.8 is equal to a probability of 0.2119 and that at 1.2 is 0.8849. The difference is 0.673. Hence answer is C.
For problem 2, the z score at 99% is 2.33 hence, the equation becomes 2.33 = (x-30)/6 where x is the noise level threshold. Answer is D. 43.96 decibels.</span>