3/ If f(x) = 2x -5 Find f(x-1)=

Explanation: Here we have function f(x) = 2x - 5

and we're asked to find f(x - 1).

Don't be thrown off if you're asked to plus a variable into a function.

If f(x) = 2x - 5, then f(x - 1) = 2(x - 1) - 5.

Remember to use parenthses when substituting into a function.

So simplifying on the right side, we would distribute the 2

through the parenthses and we have 2x -2 - 5.

Now combining like terms, we have 2x - 7

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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.