# Posts by Betsy

Total # Posts: 74

math
Suppose the scores of students on an exam are normally distributed with a mean of 393 and a standard deviation of 57. According to the empirical rule, what percentage of students scored between 279 and 507 on the exam

math
Kyle wants to form rectangles using straws.he has two straws of 6 inches long, two straws 4 inches long, and two straws 2 inches long.using four straws attached at the ends, how many different rectangles can Kyle form¿ what are the perimeters of the rectangles¿

math
so each box has just 1 level of cans since height = 1ft 3ft x 2ft = 36in x 24 in so whe have 36/6 = 6 cans in one dimension and 24/6 = 4 cans in the other dimension we have 6x4 = 24 cans per box ==> answer 1 --------------- volume of the box = 36x24x12 = 10368 in^3 volume ...

Math
The pressure on a scuba diver at sea level is 14.7 pounds per sq inch (psi). The pressure increases 0.445 psi for each foot of depth. Suppose the pressure on a diver is 41.4 psi. How deep is she? A spring is 2 in long with no weight suspended from it. For each ounce of weight...

math
Anna and Tim saw two movies in one day. The two movies lasted 4 hours. One movie was half an hour longer than the other. How many hours did the shorter movie run?

math
25/5 -4 * 2/9

statistics
A study of peach trees found that the average number of peaches per tree was 625. The standard deviation of the population is 140 peaches per tree. Ascientist wishes to find 80% confidence interval for the mean number of peaches per tree. How many trees does she need to sample...

early chlhood
Ms. Sue you do not know me and I do not know you. I am not a cheater because I have a lot going on in my life. My husband has stage four cancer and I am trying to finish school and also take care of my two small children. I watching my husband die in front of my eyes and that ...

early childhood
By six to twelve months of age an infant is a specialist in his own native language. Explain.

early childhood
What problems might non-English speaking preschoolers encounter in their attempts to play with others?

early chilhood
If an early childhood teacher were to learn a second language along with learning Standard English, what language should it be?

early childhood
Name four elements of successful English-language leaner programs for preschoolers.

early childhood
Name four child characteristics that might make a preschool child hard to identify as talented or gifted.

early childhood
To promote infant (six to twelve months) speech growth, name five useful adult techniques.

math 140
Use differences to find a pattern in the sequence. 1,1,11,36,81,151,251 Assuming the pattern continues, the eight term should be.

math 140
If 5 is added to a number the sum is tripled, the result is 31 more than the number. Find the number.

Math
-56

math140
If 5 sweaters cost \$66.35 how much would 8 sweaters cost?

math 140
7(3x+9)+(x+3)=11

math 140
4-5z=19

math 140

math 140
A football team gained 12 yards on one play, lost 40 yards on another, and gained 34 yards on the last play of the first half. They had already gained 345 already during the half. What was the total yardage gain for the first half?

math 140
There were 610 people at a play. The admission price was \$3.00 for adults and \$1.00 for children. The admission receipts were \$1,250.00. How many adults and children attended?

math 140
The math scores of a math test for five students were posted on the bulletin board. The students' names are Rod, Penny ,Jake, and Fred. Rod and Fred scored the same number of points. Penny did not get the highest score. John's score was 5 points lower than Jack's. ...

140
Tom and Andy find a long drainage pipe in a vacant lot. It is big enough so that each boy can just manage to squeeze into it and crawl from one end to the other. If Tom and Andy go into the pipe from opposite ens, is it possible for each boy to crawl the entire length of the ...

Math
What is the principle and the interest? A=\$2719.50 P= ? r=6.1% t=20 years What is the interest rate? Balance= \$3742.50 p=\$3000 interest rate= ? t=45 months

Math
1)A bakery can sell muffins for \$1 each. If it costs the bakery \$5 to make 20 muffins, what percent of the money made from muffins sales is profit? 2) A community is considering increasing the sales tax rate 0.5% to fund a new sports arena. If the tax rate is raised, how much ...

math
A community is considering increasing the sales tax rate 0.5% to fund a new sports arena. If the tax rate is raised, how much more will you pay in sales tax on \$500?

Math
Stanely is 6ft tall. He wants to stand in the shade of a tree that is 35ft tall. If the tree casts a 10ft shadow, what is the farthest Stanely can stand from the tree and be completely in its shadow? Round your answer to nearest tenth of a roof?

Math
A 40ft tall monument casts a shadow that just reaches the base of a 4ft tall parking meter. If the parking meter's shadow is 6.5ft long, how far apart are the monument and the meter?

Math
The first social studies test had 16 questions. The second test had 220% as many questions as the first test. Find the number of questions on the second test.

Math
An airplane traveled from Boston to Las Vegas making a stop in St. Louis. The plane traveled 2410 miles altogether, which is 230% of the distance from Boston to St. Louis. Find the distance from Boston to St. Louis to the nearest mile.

Math
Tricia read 1/4 of her book on Monday. On Tuesday, she read 36% of the book. On Wednesday, she read 0.27 of the book. She finished the book on Thursday. What percent of the book did she read on Thursday?

Math
8hr/1day * 7days/1week. Cross Cancel (day with days) You now remain with hrs per week After you remain with 8hr * 7 Which equals 56hrs in One Week Remember You Are Using Dimensional Analysis

math
Wyatt and Allyson were asked to solve a percent problem using the numbers 13 and 38. Wyatt found 13% of 38 and Allyson found 38% of 13. Explain why they both got the same answer. Would this work for other numbers as well? Why or why not?

algebra
Katie says that if the coefficients of each variable are identical, then she does not need to solve the system since it will always have infinite solutions. Is she correct?

Algebra
If someone invests \$8000 at 7%, how much additional money must he invest at 4% so that his total annual income may equal 5% of his entire investment?

Math
Ellory budgets at most \$20 each week for lunch. She has spent \$17.75 so far this week. Write and solve an iequality to determine how much more Ellory can spend and stay within her lunch budget.

Math
3x/4 - 2x/3 = 2/5

Math
3k/4 - 28 - 2k/3 = 37

math
i think yes because 350-206 equals 140

Math
A phone call costs \$0.58 for the first 3 minutes and \$0.15 for each additional minute. If the total charge for the call was \$4.78, how many minutes was the call?

Math
Heather worked for 15 3/4. She was paid a total of 102 3/8 dollars. What is Heather hourly wage?

Math
Grace ddrove 159 miles and used 5 3/10 gallons of gas. How far could she go with one gallon of gas?

2 HgCl2 (aq) + SnCl2 (aq) --> SnCl4 (aq) + Hg2Cl2 (s) Hg2Cl2 (aq) + SnCl2 (aq) --> 2Hg (s) + SnCl4 (aq) For each reaction, write the two half-reactions that make it up and calculate the overall reaction potential by adding the two half-reactions. Each overall potential ...

math
A plane flies the first half of a 5600 km flight into the wind in 3.5 hours. The return trip, with the same wind, takes 2.5 hours. Find the speed of the wind and the speed of the plane in still air.

physics
A toy car rolls at a constant speed down a straight inclined track. When the car reaches the flat surface at the base of the inclined track, the speed of the car decreases.

Pre-Calc
cot 19.8 degrees

Algebra 1
f(x)=xcubed - 2xsquared + 4x-7, what is f(0)

math
x=925

trig
True or false? If A and B are angles of a triangle such that A > B, then cos A > cos B.

AP Physics
An object has a mass of 80 kg on earth. the acceleration of gravity on Mars is about 1/4 of the acceleration of gravity on Earth. What is the weight of the object on Mars?

AP Physics
A marble is dropped from a height of 10 m. A 2nd marble is rolled off a 10 m table at 5 m/s. A 3rd marble is fired at 5 m/s at an angle of 45 degrees off the table. Which one is going 15 m/s when it hits the ground?

Math
Explain how numbers can be used to name something.

arithmetic
i need help solving this problem: 2.75+.003+.158?

Hello - i need help to understand a study case. can 3 partners of a limited company ge rid of the fourth by just voting him out please? thanks a lot!

chemistry
This is how I tried to answer... 1 mol of Mg= 24.3g 1 mol of O= 16.0 g 2.0 g Mg = 0.0823 mol Mag 1.317 g O (3.317-2.0) = 0.0823 mol O empirical formula is MgO

chemistry
A 2.000 g sample of magnesium was burned in air to form an oxide. After the product was purified it was found to have a mass of 3.317 g. What is the empirical formula for the product?

11x=8x-6

chemistry
If Pdcb replaces naphthalene as an active ingredient in mothballs , what is the value of kf for camphor if a 0.260 m solution of PDCB in camphor decreases the freezing point of camphor by 9.8 degrees C. I am sure that you will use the formula ^T=-kfm. Since you are given the 0...

Physics
a child causes a wagon to accelerate by pulling it with a horizontal force. newton's third law says that the wagon exerts an equal and opposite force on the child. how can the wagon accelerate

Math
is it just tanx?

Math
find the second derivative of ln(sinx) i worked this out and i got -tanx

Geometry
How can I prove a line is an altitude

science
What happens to a vesicle in exocytosis?

science
What are vesicles?

science
How are glucose molecules moved into a cell?

Science
How does osmosis explain the fact that a watery syrup forms when you put sugar on strawberries?

thank you

ecology
What is a cloroplast