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Topic: **Addition and subtraction homework****Question:**
Thanks so much in advance! Use addition, subtraction,multiplication, and division signs to fill in the blanks for the problems. You can also use parentheses and brackets. to make a division sign, just do a forward slash (/);and please use an asterick (*) for multiplication signs. thanks again!
20 8 4 4 = 18
2 8 1 2 = 28
5 8 2 7 = 3
Especially the third one thanks

July 20, 2019 / By Rowan

5 - (8 + 2) + 7 = 3 20 + (8/ 4) -4 = 18 2 (8-1) 2 p.s. just in case didn't know, of it is next to parentheses with no other sign, it means multiply

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1. (0,0) check... y < 2 - 2x ......................y > 2x - 3 0 < 2 - 2(0) ....................0 > -2(0) - 3 0 < 2 (correct)................0 > -3 (correct) 2. (-1,1) does not satisfy the inequality 3. C. a + b <= 9 .22a + .42b >= 3 4. Multiply the first equation by 2 5. 4x + 3y = 1 2x - 3y = 1 ---------------------add 6x = 2 x = 2/6 which reduces to 1/3 now sub 1/3 in for x in either equation to find y 2x - 3y = 1 2(1/3) - 3y = 1 2/3 - 3y = 1 -3y = 1 - 2/3 -3y = 3/3 - 2/3 -3y = 1/3 y = (1/3) / -3 y = 1/3 * -1/3 y = - 1/9 Solution is : B (1/3, -1/9)

The Sin of Angle A is Opposite Over Hypotenuse The Cos of Angle A is Adjacent Over Hypotenuse For any Acute Angle, in a Right Triangle, Opposite over Adjacent Gives the Tangent of Angle A Sin(72)= Opposite/Hypotenuse and Cos(72)= Adjacent/Hypotenuse so...... Sin(72) x Hypotenuse = Opposite Cos(72) x Hypotenuse = Adjacent

Geometry & trigonometry students in US high schools generally are quite familiar with the special right-angle triangles (RATs) of angles 30 – 60 – 90 & 45 – 45 – 90. (Very little is taught in US high school trig about other special RATs. So, I'm guessing you're either not in the US or you're in a US college or university.) But, 18 – 72 – 90 is a special RAT with (ugly) ratios: 1 – √(5+(2√5)) – (1 + √5) or rounded: 1 – 3.0777 – 3.2361. (Of interest to some mathematicians is the fact that the hypotenuse is twice the golden ratio.) A place to start for your homework might be http://en.wikipedia.org/wiki/Exact_trigo... Searching the net using multiples of 18 may also help. Some links to get you started http://staff.jccc.net/swilson/trig/trig1... http://userpages.monmouth.com/~chenrich/... math.berkeley.edu/~theojf/08Fall32/Han... http://www.zaimoni.com/Trig.htm#Ref18deg36deg54deg72deg [incorrectly states that trig is math reduced to 'brute memorization'] [Historical note: In ancient math times (that is before computers & calculators were common), some trig tables were available in multiples of 3 (18 - 15 = 18 - (45 - 30)) because the exact values could be found using various formulas [Like, sin (α ± β) & cos (α ± β)]

which angle is the 72? sin cos or tan? You have that angle as well as the 90 angle so it is just some simple algabra.

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