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Math homework help.please?

Math homework help.please? Topic: Addition and subtraction homework
July 20, 2019 / By Rowan
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
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Best Answers: Math homework help.please?

Nan Nan | 6 days ago
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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Nan Originally Answered: Can you help me with some math homework?
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)

Nan Originally Answered: Need help with math homework.?
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
Nan Originally Answered: Need help with math homework.?
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)]
Nan Originally Answered: Need help with math homework.?
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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