problem solving.

a. Find 12/25 divide by 1/5 in two different ways. Explain your methods. b. Explain, using a diagram, how the following problems illustrate the two interpretations of division: partitive division ans measurement division. i. A road crew repaves 1 1/2 miles of road each day. How long will it take the crew to pave a 3/4 mile stretch of road? ii. A piece of coaxial cable 4/5 metre long is to be cut into eight pieces. What is the length of each piece?

solving word a word problem

explain how you woul help students understand that 3/4 is the same as 0.75. include in your development a translator to 75/100 and from that form to the decimal from using models fo each translation. also, how would you teach students to compare the fractions3/7 and 5/8 whithout using models or cross multiply to identify which fraction is lager.

i need them by friday

i need them by friday. When we solve a rational equation, why is it OK to remove the denominator by multiplying both sides by the LCD? Why can you not remove the denominator when simplifying a rational expression? Provide examples to support your discussion. 2. What are extraneous solutions of an equation? Why do they sometimes occur when we solve rational or radical equations? Provide examples to support your discussion.

Probability (Find Mean and Standard Deviation)

In order to test a vaccine, we have to find patients with a certain blood type, that is found in 20% of the population. Model W, the number of people sampled until we have found one with thhis blood type; X, the number sampled to find four with the blood type; and Y, the number with this blood type among 20 people. Find the means and standard deviations of W, X and Y. *See attachment for partial solutions

Fractions Notations: Multiplication and Division (check)

1. Find the prime factorization of 54. ____a. 2.2.2.3 _x__b. 2.3.3.3 ____c. 2.2.17 ____d. 2.2.3.3 2. Determine which of the following is divisible by 3. ____a. 3106 ____b. 2251 _x__c. 1239 ____d. 1172 3. Determine which of the following is divisible by 8. __x_a. 1336 ____b. 1473 ____c. 1534 ____d. 1662 4. Identify the denominator of 8/12. _x__a. 12 denominator ____b. 8 ____c. 4 ____d. 2/3 5. In 1997, there were 3043 county governments in the United States. Of these, 3 were in Delaware. What was the ratio of county governments in Delaware to total county governments? ____a. 3043 __x_b. 3043/3 ____c. 3 ____d. 3/3043 6. Simplify:... click for more