# Helen

Newest questions and responses by Helen
1. ## Math

When a fifth of a certain number is added to 3,the result is 17 .what is the number?

2. ## Chemistry 131

4.0g of an unknown potassium halide (KX, where X is the halide) is dissolved in 100g of water. The solution freezes at -1.28 degrees Celsius. What is the identity of the halide?

3. ## Algebra

How would you solve this systems of equations? Y-7=-2x 4x+2y=14

58. ## math

How can $12,600 be split between two investments, one paying 6% annually and one paying 8% annually so that the interest from the two accounts equals$864

59. ## Gr.11 Biology

In guinea pigs, black cot is dominant to albino. Rough coat us dominant to smooth coat. A black smooth guinea pig was mated with an albino rough guinea pig. Their offspring were black rough and black smooth. If these were the only produced over a period of

60. ## Gr. 11 biology

Your aunt moves out of the town and leaves you her mouse, Henry. In order to make some money, you decide to breed mouse and sell the offspring. In looking over Henry's family history, you discover that Henry's grandfather expressed a rare genetic disorder

61. ## Gr.11 Biology

In humans, muscular dystrophy is a condition in which the muscles waste away during early life, resulting in death in the early teens. It is due to recessive sec-linked gene. A certain couple have 5 children- 3 boys, ages one, three and ten; and 2 girls,

62. ## Math

Connor ran around the 1/4-mile track 15 times! Express the distance he ran as a mixed number.

63. ## Data management

Which of the following three events is more likely to happen that a person get a) At least 1 six when 6 dice are rolled; b) At least 2 sixes when 12 dice are rolled, or c) At least 3sixes when 18 dice are rolled. Explain why.

64. ## Data management

Problems solving with Matrices [-3 1] * [ 4 7 0] 2 5 -3 -5 1 I'm stuck with this matrices. Please help me~~

65. ## Math

Determine the probability of drawing two cards from a deck( without replacement) and getting the same suit using 1) conditional probability 2) combinations

66. ## Math

Ali has 250 songs on her MP3 player. Of those, 150 are dance songs, 50 are R&B songs, and 30 songs are both dance and R&B. 1) when Ali has her player on shuffle, what are the odds in favour of her hearing a dance song that is not an R&B song? 2) what are

67. ## Math

Suppose that a graphing calculator is programming to generate a random natural number between 1 and 10 inclusive . What is the probability that the number will be prime?

68. ## Math

nPr=6720 and nCr=56, then the value if r is___?

69. ## Data management

In the expansion of (1+x) to the power of n, the first three terms are 1-0.9+0.36. Find the values of x and n.

70. ## Gr.12 data management

There are 52 white keys on a piano. The lowest key is A. The Keys are designated A. B, C, D, E, F, G in succession, and then the sequence of letters repeats, ending with a C for the highest key. A) if five notes are played together simultaneously, in how

71. ## chemistry

Explain the following quote with your understanding of the concept of gas mixtures (Ch. 10 concepts) and the composition of “common air” (i.e. the air in the atmosphere). Inflammable air is hydrogen. “By the experiments... it appeared that when

72. ## English

What is wrong with this sentence? Although they seemed inflamed, the site of the previous craniectomy seemed free of defect.

73. ## Chemistry

determine the mass of titanium and iodine that react if 1.38 x 10 to the third kJ of heat emitted by the reaction

74. ## Chem

What mass of KCl in grams is formed when 2.00lbs of KClO3 is decomposed?

75. ## Calculus 2 - Series

I am so confused on how to do series problems...especially these. How can you tell the pattern and determining the formula for them? Can someone please help? 26) Write the first five terms of the sequence {an} whose nth term is given. an = (n + 3)/(2n −

76. ## algebra

An advertising agency conducted a survey and found that the number of units sold, N, is related to the amount, a, spent on advertising (in dollars) by the following formula:

77. ## Math

Tension wants to build a soccer field for his team. The area of the field should be 125 square feet. The width is 1/5 of the length. What are the dimensions of the field?

78. ## Sociology

How can I get an essay in Sociology?

79. ## finance

Suppose an investment offers to triple your money in 36 months (don’t believe it). What rate of return per quarter are you being offered

80. ## math

Valerie and Bret have a total of 24 dog show ribbons.Bret has twice as many ribbons as Valerie.How many ribbons does each have?

81. ## physics

A woman raises a 65N box 16m in 4 seconds.Calculate the work done by the woman on the box

82. ## Finite Math

suppose x sheets from a 500 sheet ream of paper have been used. Write an algebric expression to represent the number of sheets that are left

83. ## chem

How many moles of carbon, hydrogen, and oxygen are present in a 100-g\rm g sample of ascorbic acid?

84. ## chem

How many moles of carbon, hydrogen, and oxygen are present in a 100-g\rm g sample of ascorbic acid?

85. ## English

Words to choose from: Commemorate, complacent, consensus, deplete, diligent, empathy, menial, niche, transcend, and waive At Eastman High School reunions, the conversation usually gets around to the question “who was our best teacher?” And year after

86. ## economics

To save on gasoline expenses, Edith and Mathew agreed to carpool together for traveling to and from work. Edith preferred to travel on I-20 highway as it was usually the fastest, taking 25 minutes in the absence of traffic delays. Mathew pointed out that

Identify four research sources that provide context for at least three activities of strategic leaders.

88. ## Geometry

The word cosine literally means "the complement of the sine." Write a paragraph explaining how complements of sine and cosine are connected. I know that the sine and the cosine of complementary angles are the same. but how can i add more details/write a

Some people believe in the force (yes, like in Star Wars). To test if young Anakin Skywalker has the force with him, he is told that some cards that Yoda can see but Anakin cannot contain a picture of a planet, a lightsaber, a laser rifle, or a spaceship.

90. ## Help ASAP Statistic

. A new medical test provides a false positive result for Hepatitis 2% of the time. That is, a perfectly healthy subject being tested for Hepatitis will test as being infected 2% of the time. In research, the test is given to 30 healthy (not having

91. ## Chemistry 2

Compare endothermic and exothermic reactions in terms of potential energy, heat flow, and observed temperature changes. Explain your answer in complete sentences.

92. ## chemistry

Freezing and Melting are two different physical changes that involve the same amount of energy. compare and contrast the potential energy diagrams that would represent each of these processes. Be specific in your comparison.

93. ## check one question statistic

For the scenario below, determine if the experiment describes a geometric distribution. If it is not a geometric setting, state why. if it is a geometric a) the two outcomes head or not head b) What constitutes one trial Flip a coin constitutes a flip coin

94. ## Statistic

consider caleb the basketball player. In a game, he shoots 10 free throws. In the year, he makes 70% of his free throws. Is this a binomial setting? Fully explain your response.

95. ## statistic

here are five seniors in a class, for each situation, write how the binomial formula is used to calculate the probability. a) In how many ways can you choose one senior to represent the group? b) In how many ways can you choose two seniors to represent the

96. ## *****Help Statistic

Imagine taking a 10-question true or false exam. You randomly guess at each question. Don't do any calculations, just tell me your first impressions a). Is this a binomial setting? b) How many question do you think you would get correct? c). How surprised

97. ## Canvas art

Who paints using the name Cobot

98. ## Canvas art

Who paints using the name Cabot

99. ## statistic****help*****

if three coins are tossed, what is the number of equally likely outcomes? 3 4 6 8 9

100. ## help ASAP Statistic

The tests done to determine if someone is HIV positive are called Enzyme immunoassay or EIA tests. The test screens a blood sample for the presence of antibodies to HIV. Like most tests, this test is not perfect. The table below shows the approximate

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