The system of equations representing the number of Blue-ray discs and DVD's after t months are:
507 + 26t
925 - 12t
Each month, the number of DVD's sold decreases by 12, this can be modelled as:
number of DVD in opening month - (monthly decrease x number of months)
Number of DVD's in t months = 925 - 12t
Each month, the number of Blue-ray discs sold increases by 26, this can be modelled as:
number of blue-ray discs in opening month + (monthly increase x number of months)
Number of Blue-ray discs in t months = 507 + 26t
To learn more about growth rate, please check: brainly.com/question/18760477
This is a tricky question that Reina and Sam are multiplying (84)5 (73)9and their work are (84)5 (73)9 = 84 + 573 + 9 = 89712 Reina's(84)5 (73)9 = 84⋅573⋅9 = 820727 Sam'sActually they are doing or multiplying using exponents.
Reina’s work (8⁴)₅(7³)⁹=8⁴⁺⁵+ 7³⁺⁹= 8⁹ 7¹²This is incorrect because she added exponents instead of multiplying exponents
Sams work (8⁴)⁵ (7³)⁹=8⁴ˣ⁵ 7³ˣ⁹= 8²⁰ 7²⁷This is correct because Sam multiplied exponents correctly
Exponents are multiplied not added.
First of all, 'simultaneous' equations means more than one equation.
You have a set of them, with as many equations as there are variables
in them.
Here you wrote ' 5a + 2b = 14 '.
You can't do anything with this single equation, except maybe graph it
and get a straight line. If you want to find the values of 'a' and 'b', you
need another equation with 'a' and 'b' in it, and the two equations together
are called 'simultaneous' because they're both true at the same time.
If you graphed both of them, you would find that each equation makes a
different straight line. The lines cross at one point, and the (a,b) at that
point is the solution of the simultaneous equations. But there are other
ways to solve the pair of equations without graphing them. Those are
the ways to 'do' them that were probably being discussed in class.
If you post a pair of simultaneous equations here on the site, somebody
is sure to solve it for you. And if you get really lucky, they may even explain
how they did it.
Answer:
177 square cm
Step-by-step explanation:
The radius is half the diameter, so r=7.5 cm. Substituting into the formula for the area of a circle, 
square cm.
A) w * L = 112
B) 2w + 2L = 44
A) w = 112 / L then substituting this into B)
B) 2 * (112/L) + 2L = 44
B) 224 / L + 2L = 44
B) 224 + 2L^2 = 44L
B) 2L^2 -44L +224 = 0
L = 14
L = 8
Double Check
Width = 14 Length = 8
2*14= 28 2*8 = 16
28 + 16 = 44
14*8= 112
Correct!!!
