We are given with the expressions A as 2/3x + 3/5y = 12 and B as 5/2y - 3x = 6. To eliminate y, we should multiply each function with a number that when the two functions are added, y cancels out. In this case, we multiply A by 5/3 and B by -2/5. Hence the answer is D. <span>D. 5/3A - 2/5B</span>
Part A: Well product of two rationals is always rational. And the sum of a rational and an irrational is irrational.
They give you too much freedom in your choice though. Like for part A, what if we let b=-1 (rational) c=pi (irrational d=pi (irrational) Then bc+d = -pi + pi = 0 (rational) Maybe they didn't want you to consider 0 because otherwise all of these options can be rational.
Do you understand the difference between a rational and irrational number? Rationals can be written as a fraction containing whole numbers. Irrationals can not. Here are some examples of rational numbers: <span>3/2</span> is rational because its a whole number divided by a whole number. 7 is a rational number because it can be written as <span>7/1</span>. <span>−4</span> is a rational number, it also can be written in this form <span><span>−4/</span>1</span>. This next one maybe seem surprising, but, 0 is a rational number. It also can be written as <span>0/1</span>, but not as <span>0/0</span> (Which is not a number).
So in the end
A: <span> virtually any sum or product involving an irrational number will be irrational.
</span>B. <span>(√7)^2 = 7 ... rational
</span>C. <span>all numbers involved are rational, so this result is rational</span>
Answer:
Step-by-step explanation:
In order to find the answer to this question you must simply divide.
Hope this helps
Answer:
<em>= 4a + 11</em>
Step-by-step explanation:
a+7+3a+4
Combine Like Terms:
= a + 7 + 3a + 4
= (a + 3a) + (7 + 4)
<em>= 4a + 11
</em>
Step-by-step explanation:
2nd one I think.........?