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3 years ago

Solve the equation x+0.7=1-0.2x In two different ways

1 answer:

3 0

Add 0.2x to both sides
1.2x+0.7= 1
1.2x=.3
x=.3/1.2
x=.25

option #2
subtract .7 on both sides

x=1-.7-.2x
x=.3-.2x
1.2x=.3
x=.25

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The ratio of boys to girls in the Grade 3 classes at Domino Primary school

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Answer:

28 learners

Step-by-step explanation:

Boys : Girls

3 : 4

Since there are 12 boys and 3 units of them...

3 units = 12

1 unit = 12 ÷ 3 = 4

Girls =

4 units = 4 x 4 = 16

Total number of girls and boys: 12 + 16 = 28

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3 years ago

A square piece of plastic has a perimeter of 8 cm. how long is each side of the piece of plastic?

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Answer:

Step-by-step explanation:

Since it is a square, all four sides are equal and its perimeter is just

P=4s, so if P=8 then

4s=8, dividing each side by 4 we get

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So each side of the plastic square is 2 centimeters.

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3 years ago

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The length of a rectangular lot is 6 feet less than 3 times its

Katen [24]

Answer:

Length = 22.98 feet

Width = 9.66 feet

Step-by-step explanation:

Let the length of the rectangle be L.

Let the width of the rectangle be W.

Given the following data;

Area of rectangle = 222 feet²

Translating the word problem into an algebraic expression, we have;

L = 3W - 6 ...... equation 1

We know that the area of a rectangle is given by the formula;

A = L * W

Substituting

222 = L * W ....equation 2

Substituting eqn 1 into eqn 2, we have;

222 = (3W - 6) * W

222 = 3W² - 6W

Rearranging the equation, we have;

3W² - 6W - 222 = 0

Next, we would use the quadratic formula to solve for the roots.

Note: the standard form of a quadratic equation is ax² + bx + c = 0

a = 3, b = -6 and c = -222

Solving the quadratic equation using the quadratic formula;

The quadratic equation formula is;

$x = \frac {-b \; \pm \sqrt {b^{2} - 4ac}}{2a}$

Substituting into the equation, we have;

$x = \frac {-(-6) \; \pm \sqrt {6^{2} - 4*3*(-222)}}{2*3}$

$x = \frac {6 \pm \sqrt {36 - (-2664)}}{6}$

$x = \frac {6 \pm \sqrt {36 + 2664}}{6}$

$x = \frac {6 \pm \sqrt {2700}}{6}$

$x = \frac {6 \pm 51.96}{6}$

$x_{1} = \frac {6 + 51.96}{6}$

$x_{1} = \frac {57.96}{6}$

x1 = 9.66

We do not need the negative value of x, so we proceed.

Therefore, Width, W = x1 = 9.66 feet

For the length;

L = 3W - 6

L = 3(9.66) - 6

L = 28.98 - 6

L = 22.98 feet

4 0

3 years ago