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Mnenie [13.5K]
3 years ago
10

Hellpp mee plzzz anyonee

Mathematics
1 answer:
kozerog [31]3 years ago
4 0
On the first one you add the first 2 numbers then subtract that from 7 1/2
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Factor 4a2 - 25.<br><br> A. (2a + 5)(2a + 5)<br> B. (2a - 5)(2a - 5)<br> C. (2a - 5)(2a + 5)
nikdorinn [45]

This is the diference of 2 perfect squares. 4 is a perfect square, x^2 is a perfect square, and 25 is a perfect square. The pattern for this is (ax + b)(ax - b). Our a is 2 since 2*2 = 4, and our b is 5 since 5*5 = 25. So your factors are (2a+5)(2a-5), choice C.

3 0
3 years ago
A researcher was testing the number of popcorn kernels that popped out of a mini bag of 100 kernels after being cooked for the s
Lelechka [254]

Answer:

The percentage of the bag that should have popped 96 kernels or more is 2.1%.

Step-by-step explanation:

The random variable <em>X</em> can be defined as the number of popcorn kernels that popped out of a mini bag.

The mean is, <em>μ</em> = 72 and the standard deviation is, <em>σ</em> = 12.

Assume that the population of the number of popcorn kernels that popped out of a mini bag follows a Normal distribution.

Compute the probability that a bag popped 96 kernels or more as follows:

Apply continuity correction:

P( X\geq 96)=P( X>96+0.50)

                 =P( X>96.50)\\=P(\frac{X-\mu}{\sigma}>\frac{96.50-72}{12})\\=P(Z>2.04)\\=1-P(Z

*Use a <em>z</em>-table.

The probability that a bag popped 96 kernels or more is 0.021.

The percentage is, 0.021 × 100 = 2.1%.

Thus, the percentage of the bag that should have popped 96 kernels or more is 2.1%.

3 0
3 years ago
a triangle has a side length of 3/4 inch and a side length of 3in what could be the length in inches of the third side of the tr
eimsori [14]
I think the answer will be 6.75
6 0
3 years ago
out of 18 people in the glee club, 11 have dogs and 7 have cats. four people have both cats and dogs. how many club members have
Maslowich
Ans.\ 3\ people\ have\ only\ cats

6 0
3 years ago
Read 2 more answers
The sum of a number and two more than twice the number is less than 50. Find the number
prisoha [69]

Answer:


Step-by-step explanation:19 and 31


7 0
2 years ago
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