smandylee123
03.02.2020 •
Mathematics
Solve |3x - 4| = 15
a) {-19/3, 19/3}
b) {11/3, 19/3}
c) {-11/3, 19/3}
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Ответ:
option C
{-11/3 , 19/3}
Step-by-step explanation:
Given in the question an equation
|3x-4| = 15
To solve the absolute equation we need to add ± on right side of equation.
3x-4 = ±15
3x - 4 = 15 or 3x - 4 = -153x = 15+4 or 3x = -15 + 4
3x = 19 or 3x = -11
x = 19/3 or x = -11/3
The solution of |3x-4| = 15 is {-11/3 , 19/3}
Ответ:
The solution of I3x - 4I = 15 is {-11/3 , 19/3}
Step-by-step explanation:
* Lets explain the meaning of I I (absolute value)
- The absolute value of any number is the magnitude of the number
means the value of the number without its sign, we ignore the sign
of the number
- The absolute never equal a negative value
- If IxI = a, then x = a or x = -a
* Now lets solve the problem
∵ I3x - 4I = 15
∴ 3x - 4 = 15 OR 3x - 4 = -15
* Lets solve the two equation
∵ 3x - 4 = 15 ⇒ add 4 to both sides
∴ 3x = 19 ⇒ divide both sides by 3
∴ x = 19/3
∵ 3x - 4 = -15 ⇒ add 4 to both sides
∴ 3x = -11 ⇒ divide each side by 3
∴ x = -11/3
* The solution of I3x - 4I = 15 is {-11/3 , 19/3}
Ответ:
a. Jada got the measurement 16m.
b. The measured depth differ 0.2m from the actual depth.
c. There is a 12.66% error in calculation.
Step-by-step explanation:
Given,
The depth of lake = 15.8 m
a. Jada accurately measured the depth of the lake to the nearest meter. What measurement did Jada get
When a digit after the decimal point is 5 or more than that, the number before decimal is rounded to the next number.
Therefore,
15.8 rounded to nearest number is 16.
The depth of lake measured by Jada = 16 m
Jada got the measurement 16m.
b. By how many meters does the measured depth differ from the actual depth?
Difference = Approx - Exact
Difference = 16 - 15.8 = 0.2m
The measured depth differ 0.2m from the actual depth.
c. Express the measurement error ad a percentage of the actual depth.