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2 years ago

If I have an 83% percentage as my grade and I got 90% or 100% in one of my tests, what would be my final grade percentage?

Mathematics

2 answers:

Shalnov [3]2 years ago

8 0

Answer:

Step-by-step explanation:

if u got 90% then (83+90)/2=86,5%

if u got 100% then (83+100)/2=91,5%

wel2 years ago

7 0

Answer:

86.5% or 91.5%

Step-by-step explanation:

83+90=173

173÷2=86.5%

<h2>Therefore, 86.5% is the Final grade percentage</h2>

83+100=183

183÷2=91.5%

<h2>Therefore, 91.5% is the Final grade percentage</h2>

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Prove the trigonometric identity

Annette [7]

Answer:

Proved See below

Step-by-step explanation:

Man this one is a world of its own :D Just a quick question are you a fellow Add Math student in O levels i remember this question from back in the day :D Anyhow Lets get started

For this question we need to know the following identities:

$1+tan^{2}x=sec^2x\\\\1+cot^2x=cosec^2x\\\\sin^2x+cos^2x=1$

Lets solve the bottom most part first:

$1-\frac{1}{1-sec^2x} \\\\$

Take LCM

$1-\frac{1}{1-sec^2x} \\\\\frac{1-sec^2x-1}{1-sec^2x} \\\\\frac{-sec^2x}{1-sec^2x} \\\\\frac{-(1+tan^2x)}{-tan^2x}$

now break the LCM

$\frac{-1}{-tan^2x}+\frac{-tan^2x}{-tan^2x}\\\\\frac{1}{tan^2x}+1\\\\cot^2x+1$

because 1/tan = cot x

and furthermore,

$cot^2x+1\\cosec^2x$

now we solve the above part and replace the bottom most part that we solved with $cosec^2x$

$\frac{1}{1-\frac{1}{cosec^2x} } \\\\\frac{1}{1-sin^2x} \\\\\frac{1}{cos^2x}\\\\sec^2x$

Hence proved! :D

4 0

2 years ago

Answer choices:<br>A (3 , -4)<br>B (4 , -7/2)<br>C (-5 , 8)<br>D (5/2 , -17/4)

zhuklara [117]

Answer: D (5/2, -17/4)

Step-by-step explanation: Using elimination your goal is to get rid or 1 variable so you can solve for the one that's left. By adding the -2y and 2y you will get 0. You will also add the 3x+x (4x) and -1+11 (10). You have now gotten rid of the y and have 4x=10. By dividing each side by 4 we now know x =2.5. D is the only possible solution with x=2.5 (5/2) but to solve for y you plug 2.5 in to an equation as x so) x-2y=11

2.5-2y=11

-2y=8.5 Answer D (5/2,-17/4) y=-17/4 (4.25)

4 0

2 years ago

Can you help me please?

melisa1 [442]

Answer:

it is a it the first one. 7/13

5 0

2 years ago

Read 2 more answers

Also explain how you got your answer please