# Search results

1. ### Pleas help! exam tommarow Trigonometry word problems

Pleas help! exam tommarow!!!! Trigonometry word problems Hi, i really need help with this question, on a wall, a spider is 100cm above a fly. the fly starts moving horizontally at the speed of 10cm/s. After 1s, the spider begins moving at twice the speed of the fly, in such a way as to...
2. ### Sequence and series word problem

Its supposed to be sequences and series so what I was doing was finding the % of medicnin that was in his body, but I guess this approach was wrong So I have to find the amount of medicin that is in his body So... t0=5oomg t1=625mg t2=656.25 Then tn-1 x 0.25+500 would be the recursave fomula
3. ### Sequence and series word problem

Tod injured his wrist while he was skateboarding. To relive the pain his doctor prescribed him some medication. He takes 500mg of medicine every 6h. Only 25 % of the medication remains in his body by the time he is ready to take another pill. Write and equation to model this. so 25% is...
4. ### Counting backwards; Sequences

1. are you sure? the answer in the back of the book sayes it is 34 and i cheked it again. _____________________________________________________________ 2. ok, thanks _______________________________________________________________ 4. the sum of 50 consecutive even intergers is 3250. tha...
5. ### Counting backwards; Sequences

Please help I have ALOT of questions!! 1.)Starting at 888 and counting backward by 7, a student counts 888, 881 and 874, and so on. Which of the following numbers will be included? a) 35 b) 34 c) 33 d) 32 e) 31 Ok, so I by using the calcuator the aswer is 34, but how would you calcuate...
6. ### Arithmetic series

^ ok, thanks for all your help
7. ### Arithmetic series

OK, these questions are supposed to be really easy, but I keep geting the wrong answer and I don't understand why, could someone pleas look at my work and tell me what I am doing wrong? Find the indicated sum of each arithmetic series S15 for 4 + 11 + 18 + ... Sn= n/2 [ 2a + ( n - 1 ) d...
8. ### Problem Solving question with circles

1.what is the equation of the largest circle that can be incribed in a square of side length 9 units, if the diagonals of the square intersect at (-1,3). where the radious is 9, but the ansewer in wrong *** 2.Todd is flying his radio-controilled airplane abouve the ground in a circular path...
9. ### Write an equation for the circle

k thanks for you help
10. ### Write an equation for the circle

ya, the book is old maby that answer is wrong. root 25 is 5 soo.. 5root2?
11. ### Write an equation for the circle

^ thanks I thought the two numbers were 25 and ...but how do you rght that? 2root25 simplify es to 2root5, but thats wrong right? the answer in the book was x^2+y^2=49
12. ### Write an equation for the circle

Hi, I need help with these questions Given the endpoints of a diameter, write an equation for the circle. a) (-3,5) and (1,3) I tryed this m= (x1+x2)/2, (y1+y2)/2 = (-3+1)/2 , (5+3)/2 = -2/2, 8/2 = (-1,4) ( x-h)^2 + (y-k)^2=r^2 (x+1)^2 + (y-4)^2=r^2 (1+1)^2 +...

^ ok, thanks
14. ### Periodic function problem

f(7)=-2 f(7)=(7+12+12+12) =f(43) so f(43)=-2 is that right, what about f(11)? or do i not need to use that?
15. ### Periodic function problem

^ I don't get it can u show me an example? or would it be like this f(x)=f(x+na) f (43)=f(7+12(-2)) f(43)=-17
16. ### Periodic function problem

I can someone pleas help me with this problem? Thanks. A periodic function f has a period of 12. If f(7)=-2 and f(11)=9, determine the value of f (43) how do you do this?
17. ### Trig functions translations and combinations of transfomations word problems

the ansewer in the back of the book is y=5sinpi/6(t-3)+16 But waht I dont understand is how did they know that the graph is moved 3 to the right and 16 units up? I dont understand how they got these numbers from that question, if the low tide is 11m, then would'nt that be the lowest point of...
18. ### Trig functions translations and combinations of transfomations word problems

Hi, I really need help with this question 1) the water depth in a harber is 21m at hight tide, and 11m at low tide. One cycle is completed approximatly every 12h. a) find an equation for the water depth as a function of the time, t hours, after low tide b) Draw a graph 48h after low...
19. ### The ambigous case

I dont understand how to do these questions, involving angles less than 90 degrees. I know the "rules" you have to follow like if a<bsina there are two triangles etc. but what i dont understand is when there is a question, with no picture, how are you supposed to know witch one is the "a" and...