Answer:y= -4
Step-by-step explanation:
1 Solve for xx in 7x-4y=-127x−4y=−12.
x=\frac{4(y-3)}{7}
x=
7
4(y−3)
2 Substitute x=\frac{4(y-3)}{7}x=
7
4(y−3)
into 9x-4y=-209x−4y=−20.
\frac{36(y-3)}{7}-4y=-20
7
36(y−3)
−4y=−20
3 Solve for yy in \frac{36(y-3)}{7}-4y=-20
7
36(y−3)
−4y=−20.
y=-4
y=−4
4 Substitute y=-4y=−4 into x=\frac{4(y-3)}{7}x=
7
4(y−3)
.
x=-4
x=−4
5 Therefore,
\begin{aligned}&x=-4\\&y=-4\end{aligned}
x=−4
y=−4
Answer: 7.58 years
Step-by-step explanation:
When it comes to finding out how long it will take for an investment to double, one can use the Rule of 72.
The Rule of 72 estimates the amount of time it will take to double an investment when you divide 72 by the interest rate:
= 72 / r
= 72 / 9.5
= 7.58 years
I cant see the whole question please provide more details
Answer:
Part 5) 
Part 6) The ratio between the circumference and diameter of a circle, is equal to the number π
Step-by-step explanation:
<u><em>The questions in the attached figure</em></u>
Part 5)
we know that
The circumference of a circle is equal to
where
D is the diameter
we have
substitute
Part 6) What is the ratio between the circumference and diameter of a circle?
we know that
The circumference of a circle is equal to
where
D is the diameter
so
The ratio between the circumference and diameter of a circle, is equal to divide the circumference by the diameter
The correct option is a. 550 dm.
The 0.55 hectometers expressed in decimeters are 550 dm.
<h3>What is unit conversion?</h3>
Unit conversion is a multi-step process that involves multiplying or dividing by a numerical factor and, more specifically, a conversion factor.
- The process may also necessitate selecting the appropriate amount of significant digits and rounding.
- Different conversion units are employed to measure various parameters.
- Measuring Temperature
- Measuring Length
- Measuring Capacity
- Measuring Weight
- Conversion of units is defined as the process of converting between different units & measurements of a given quantity using multiplication or division.
- Conversion is the method of changing the amount of one form in terms of mathematics, such as inches to millimeters or liters to gallons.
- Units are used in the measurement of length, weight, capacity, temperature, and speed.
To know more about unit conversion, here
brainly.com/question/13016491
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