I’m kinda confused on how to do this question

h = 2A/b.

Step-by-step explanation:

A = 1/2 b h

We need to isolate h on one side of the equation.

We do this  by first  removing the fraction by multiplying both sides by 2:

2A = 2 * 1/2 bh

2A = bh

Now divide both sides by b

2A/ b = nh/b

2A/b = h.

hello from mrbilldoesmath!

answer:

a(n) - a(n-1) -3

discussion:

this ones a bit interesting. given a(n) = 5 - 3n consider this:

a(n-1) = 5 - 3(n-1)

          = (5 - 3n) + 3             => but a(n) = 5 - 3n, the first term

          = a(n)   + 3                 => subtract 3 from both sides

a(n-1) -3 = a(n)  

or

a(n) - a(n-1) -3

you,

mrb

180-142=38 for the acute angle next to the entry

90+38=128

180-128=52

a=52

step-by-step explanation: