Answer: B. z-311+311=151+311
Step-by-step explanation:
You do the opposite since you want to get rid of 311
Subtract 2.1 from both sides:

Add 1.4y to both sides:

Of course, we can rewrite this as

Divide both sides by 1.4

Answer: 82
Step-by-step explanation: since it is across from the 82, the answer is 82
% error = {|Approximate Value - Exact Value| ÷ |Exact Value|} * 100%
The difference of the Approximate and the Exact Value is an absolute value. Therefore, the negative sign of the difference is disregarded.
1) Estimate = 250 g ; Actual = 240 g
(250 - 240)/240 * 100% = 10/240 * 100% = 4.17%
2) Estimate = 97.5°C ; Actual = 100°C
(97.5 - 100)/100 * 100% = |-2.5|/100 * 100/% = 2.5%
3) Estimate = 10.4 ml ; Actual = 9.7 ml
(10.4 - 9.7)/9.7 * 100% = 0.7/9.7 * 100% = 7.22%
4) Estimate = 0.156 cal/g°C ; Actual = 0.185 cal/g°C
(0.156-0.185)/0.185 * 100% = |-0.029|/0.185 * 100% = 15.68%
5) Estimate = 62.5 g ; Actual = 65.2 g
(62.50 - 65.20)/65.20 * 100% = |-2.7|/65.20 * 100% = 4.14%
Answer:
<em>x and y are not in direct variation.</em>
Step-by-step explanation:
<u>Direct Variation</u>
Two variables x and y have a direct proportion or variation if:
y = k.x
Where k is the factor of proportionality. The value of k must be constant for every ordered pair (x,y). If only one of them does not have the very same k, then the relationship is not direct.
The value of k can be solved from the equation:

Let's substitute the given points in the table:
<em>(2,8)</em>

k = 4
<em>(4,16)</em>

k = 4
<em>(6,30)</em>

k = 5
Since the value of k is not constant, then x and y are not in direct variation.