a certain piece of paper has an area of 9x2+7x-30)cm^2. What are its dimensions?
\(x = {-b \pm \sqrt{b^2-4ac} \over 2a}\\ x = {-7 \pm \sqrt{49+1080} \over 18}\\ x = {-7 \pm \sqrt{1129} \over 18}\\ \)
(-7-sqrt1129)/18 = -2.2555886240457158
(-7+sqrt1129)/18 = 1.4778108462679381
so the dimensions are approx
x + 2.2555886240457158 units and x - 1.4778108462679381 units
x is a variable.
-145
65 3/5 - 24 1/3
(65+3/5)-( 24+1/3) = 41.2666666666666667 = 41 and 4/15
find three consecutive even integers whose sum is -84
(x-2)+x+(x+2)=-84
3x=-84
x=-28
so the numbers are -30, -28, -26
How about giving a proper example and we will show you how to solve it :)
what is the constant rate of change in this? 7 days to 4 inches 14 days to 11 inches 21 days to 18 inches 28 days to 25 inches
So the constant rate of change is 1 inch per day
1 times 10 is 10, add 5 is 15.
Therefore: 1*10 = 10
10+5 = 15
x/x^2 → x*x^-2 → x^(1-2) → x^-1 → 1/x
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Look at http://web2.0calc.com/questions/i-need-help_97218
what happens when you subtract by a negative number
It is like taking cold air out of a room. The room gets hotter
so 14- -5 =14 + 5 = 9
what is the angle which the sin is 2*sqrt(5)/3*sqrt(3)
\(sin\theta\;=\frac{2\sqrt5}{3\sqrt3}\\ sin\theta\;=\frac{2\sqrt5*\sqrt3}{3\sqrt3*\sqrt3}\\ sin\theta\;=\frac{2\sqrt{15}}{3*3}\\ sin\theta\;=\frac{2\sqrt{15}}{9}\\\)
asin(2/9*sqrt(15)) = 59.391102340291
\(\theta \approx 59.39 \;degrees\)
I am having a real struggle to calculate the following using a scientific calculator. This is the following: 4⇒2ndF⇒x◼√◻⇒3⇒⋅⇒5. Can you help please
I don't know what you are talking about. ?????
2/5(3m - 1) = -1/2(m - 3)
(6/5)m - 2/5 = (-1/2)m + 3/2
(6/5)m + (1/2)m = 3/2 + 2/5
(12/10)m + (5/10)m = 15/10 + 4/10
(17/10)m = 19/10
m = (19/10) / (17/10)
m = (19/10) x (10/17)
m = (19 x 10) / (10 x 17)
m = 190/170
m = 19/17
The answer is 42.
78.5=(pi)r^2. So, 78.5/3.14 = 25. r^2 = 25. The square root of that is 5.
A2 + B2 = C2
The way I was taught to do it, was to put A, and B in a square root.
19/17
21
Rubbish
It is very simple. Any time you see a number followed by %, such as 50%, it means this:
50% means: 50/100 =0.50. So 50% of 250 =50/100 x 250 =0.50 x 250 =125.
How do u do percentage? I just dont get it...... for example
What is 50% of 100 or What is 25% Of 200
-84 / 3 = - 28 this is the average of the 3 numbers. Therefore the numbers are:
-27, -28, -29 = -84
What is the answer to this?
+118659 
