Part 1
<h3>Answer: 13</h3>
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Explanation:
We'll replace every copy of x with -3. Then use PEMDAS to simplify.
f(x) = -2x+7
f(-3) = -2(-3)+7
f(-3) = 6+7
f(-3) = 13
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Part 2
<h3>Answer: -11</h3>
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Explanation:
We work backwards in a sense compared to what part 1 did. Instead of finding f(x) based on x, we determine what x must be for a given f(x).
We'll replace f(x) with 29 and solve for x like so
f(x) = -2x+7
29 = -2x+7
-2x+7 = 29
-2x = 29-7
-2x = 22
x = 22/(-2)
x = -11
Note how if you replaced x with -11, we'd get,
f(x) = -2x+7
f(-11) = -2(-11)+7
f(-11) = 22+7
f(-11) = 29
which helps confirm we have the correct answer.
The number -57/ 7 is a rational number.
<h3>What are rational numbers?</h3>
A rational number is a type of real number, in the form of;
p/q
where
- q is not equal to zero
- p is a whole number.
It is important to note that any fraction with a denominators not equal to zero is a rational number
Examples of rational numbers are 1/2, 1/5, 3/4, and so on.
Also, the number “0” is also a rational number, but when it is represented forms such as 0/1, 0/2, 0/3, etc. But, 1/0, 2/0, 3/0, etc. It is not rational
- 57/ 7 is a rational number
Thus, the number -57/ 7 is a rational number.
Learn more about rational numbers here:
brainly.com/question/12088221
#SPJ1
Answer:
Step-by-step explanation:
9 * -9 * -1 =
-81 * -1 =
81 <===
In multiplying (or dividing), if the signs are the same, the result is positive
if the signs are different, the result is negative
these rules do not apply to addition or subtraction
Answer:
156 is the answer because clearly there are 2 rectangles and the first is a 12 by 7 and the second one we have to figure that out but because the top is 12 and it says to take 3 off of each side you would get 6 and the l3 length is 12 so it would be 12 by 6 so yo uwould have to do 12 times 7 plus 12 times 6 and once you do that you would get 156
27 because 21 +6 equals 27 then 27 take21=6