Brainliest to best answer!

2 answers:

8 0

Personally for proving questions especially trigo, i reckon u memorise all of the formulas, esp double angle and half angle.

also, for other types of proving qn like prove d = 1/2 in an a.p, u can always go back to your basics, which is U1 + d = U2.

but, i would say that as long as u practice a lot of questions u should be able to recognise how to prove the questions

zheka24 [161]3 years ago

7 0

Answer:

take your time and always ask for help when needed

Step-by-step explanation:

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7 1/9 - 2 4/5 as a fraction

Leokris [45]

194/45 but it reduced to 4 14/45

7 0

2 years ago

Someone please help me with this problem

iren [92.7K]

Check the picture below.

so the rectangular prism, or that box, is really just 6 rectangles stacked up to each other at the edges, notice

front and back are just two 9x5 rectangles

left and right are just two 5x4 rectangles

top and bottom are just two 9x4 rectangles

get the area of all 6, sum them up, and that's the area of the box.