The first 7 fibonacci numbers are 1,1,2,3,5,8, each number in the sequence is the sum of the previous two numbers. thus 13=8+5 and 8=5+3. (a) what are the eighth and ninth fibonacci numbers? (b) what do you get if you subtract the 8th fibonacci number from the 9th fibonacci number?

A: 21, 34; B: 13

Step-by-step explanation:

Part A:

OK to find this answer you just need to add the 6th and 7th terms together:

Then you add your new 8th term (this term being 21) to your 7th term to get the ninth term:

Part B:

If you subtract the 9th term by the 8th term you'll get the 7th term. This is because to get the 9th term the 7th and 8th terms needed to be added together. So you'd get 13 by subtracting the 8th term from the 9th term because it is the 7th term.

step-by-step explanation:

c.   x=2.4cm

step-by-step explanation:

similar triangles are triangles which have the same shape but not the same size. this means their angle measures are equal but their side lengths are not instead they are proportional. to solve, we will set up a proportion and solve.

a proportion is two equal ratios set equal to each other. we form the ratios by finding corresponding sides (sides which match to each other on both triangles by their position). out ratios will be one side of the small triangle over the corresponding side on the big triangle as shown below:

.

to solve the proportion, we'll cross multiply by multiplying numerator with denominator across the equal sign.