The sum of 14 and a number is 14+x
we know that this equals 17, so: 14+x=17.
Let's substract 14 from both sides:
x=17-14
x=3
so the number is 3.
LCD(12, 23, 54) = LCM(2, 3, 4) = 22×3 = 12
12 = 612
23 = 812
54 = 1512
According to the given expression, the value of b if 
is -1 and + 1
Indices are expressed using exponents and bases. Some of the useful laws of indices are:
Given the expression;
This can also be expressed as:
![b^2=\frac{1}{b^{10}}\\b^2 \times b^{10} =1\\b^{2+10} =1\\b^{12}=1\\b=\pm\sqrt[12]{1}\\b=\pm1](https://tex.z-dn.net/?f=b%5E2%3D%5Cfrac%7B1%7D%7Bb%5E%7B10%7D%7D%5C%5Cb%5E2%20%5Ctimes%20b%5E%7B10%7D%20%3D1%5C%5Cb%5E%7B2%2B10%7D%20%3D1%5C%5Cb%5E%7B12%7D%3D1%5C%5Cb%3D%5Cpm%5Csqrt%5B12%5D%7B1%7D%5C%5Cb%3D%5Cpm1)
Hence the value of b from the given indices is -1 and + 1
Learn more here: brainly.com/question/20298728
X+y = 4, therefore y = 4-x when you rearrange the equation.
You can subsitute this in: x-(4-x) = 6
-4+x = 6-x
x=10-x
2x = 10
x = 5
Substitute x into the previous equation:
5+y = 4
y = 4-5
y = -1
Answer:
25.38 pounds for three roll
Step-by-step explanation:
Find and then compare the unit prices:
9.21 pounds per roll
25.38 pounds for three rolls => 8.46 pounds per roll
42.85 pounds for five rolls => 8.57 pounds per roll
Conclusion: 25.38 pounds for three rolls corresponds to the lowest (cheapest) unit price and is thus the best buy.
