Math help, i have the question and answer and explanation but not getting it?
4) If a patient doesn't receive treatment for a certain injury within 2 hours after injury, the patient's chance of survival starts decreasing by 15% each hour. If no treatment has been given within 4 hours after injury, roughly, what chance of survival will the patient have? 72%<--??? Explanation of Answer: At the end of two hours, the patient still has a 100% chance of survival. After three hours, he has an 85% of survival, or 0.85. After four hours, he has an 85% of the 85% he had at the end of three hours: 0.85 * 0.85 = 72.25% chance of survival.
Math Help! Please Answer With Explanation!?
What is 3.2 × 10^−4 m/h in centimeters per second? A. 8.889 × 10^−6 cm/s B. 8.889 × 10^−5 cm/s C. 1.152 × 10^−5 cm/s D. 1.152 × 10^−7 cm/s
10 PTS CORRECT ANSWER WITH GOOD EXPLANATION PLEASE ASNWER THESE 2 SAT II QUESTIONS?
1. A central angle of 2π would have an arc equal to the circumference of the circle (2πr=2π5=10π). A central angle of 2π/5 would yield an arc of (2π/5)(5)=2π. But that is now the circumference of the base of the cone. Thus the radius of the base of the cone is 1 and the area of the base is A = π r r = π. What is the height h of the cone? Well 5*5=1*1+h*h or h = √24 =2√6 The volume of a cone is (1/3)hA = (1/3) (2√6) π = ((2/3)√6) π 2. Inversely proportional usually means that y = k/x for some fixed k. So 6=k/2 or k=12 and the sequence is 2 6 2 6 2 6 2 6 2 6 2 6, So the 12th term is 6.
Multiple Choice questions in Maths, pls answer with steps and explanations. 10 pts, challenge?
1. Strokeball is a team sport. A match consists of four playing periods of 25 minutes each, with intervals of 10 minutes between periods. The Strokeball World Cup is currently being contested in Australia. The semi-finals are to take place in Adelaide and Perth, and both matches were originally timetabled to start at 4pm local time, on September 5th (Adelaide is 1½ hours ahead of Perth). However, at the request of television companies who wish to broadcast the whole of both matches live, with a short interval in between, the authorities have decided to bring the start of the Adelaide match forward, so there will now be 30 minutes between the scheduled end of the Adelaide match and the start of the Perth match, which remains unchanged. At what (local) time will the Adelaide match now start? A 1.20 pm B 1.50 pm C 2.40 pm D 2.50 pm E 3.20 pm The answer is "D" 2. Edwin and Ellie work together as plumbers. They charge their customers for materials plus an hourly rate for their work. Both charge the same labour rate of $20 per hour. On one particular job, Edwin buys all the materials for a total of $560. Edwin works two hours longer than Ellie on the job. The customer pays $2080 to Ellie for the work. How much does Ellie owe Edwin? A $560 B $740 C $780 D $1300 E $1340 The answer is "E"
Need steps and explanations to solve these 2 multiple choice questions in Math. 10 pts for best answerer?
For the first problem, they just want the amount of pies he should have in stock, so ignore the info. about the pastries. He sells pies to 20% of people, and another 5% also buy pies with their pastries for a total of 25% of fans buying pies. So, multiply 6000 by 25% which is 1500. Then since he always has 10% more to be safe, multiply 1500 by 110% and you get 1650. Just a minute, I'll work problem #2 now.
Math help with one question? I know the answer I just need explanation?
I'm doing some practice SAT math questions and this one question got me a little confused: If ab=c, c=b/d, and bcd does not equal 0, which of the following is equal to a? 1/d d 1 d - 1 d + 1 So the book says the answer is the first one (1/d), but I don't know how that's the answer?? Can someone please explain this to me? Thank you!
Help with these math questions? multiple choice, 10 pts?
1. A circular garden has a diameter of 12 ft. how many bags of topsoil must linda buy to cover the garden if one bag covers an area of 3 square feet? 1)13 2)38 3)40 4)151 ----------------------- 2. the graph of the equation x^2+y^2=r^2 forms.... 1)a circle 2)a parabola 3)a straight line 4)two intersecting lines --------------- 3. the midpoint of AB is (-1,5) and the coordinates of A are (-3,2). what are the coordinates of point B? 1)(1,8) 2)(1,10) 3)(0,7) 4)(5,8) any answers would be greatly appriciated! thanks!