Mathematics, 22.09.2019 09:00 mbol7123

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only solve 2 - 5

Asap 30 + brainliest only solve 2 - 5

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Answer from: collegebound3506

QUESTION 2a

We want to find the area of the given right angle triangle.

We use the formula

$Area=\frac{1}{2}\times base\times height$

The height of the triangle is =a cm .

The base is 12cm .

We substitute the given values to obtain,

$Area=\frac{1}{2}\times 12\times a cm^2$ .

This simplifies to get an expression for the area to be

Area=6a cm^2 .

QUESTION 2b

The given diagram is a rectangle.

The area of a rectangle is given by the formula

$Area=length \times width$

The length of the rectangle is l=7cm and the width of the rectangle is w=ycm .

We substitute the values to obtain the area to be

$Area=7 \times y$

The expression for the area is

Area=7y

QUESTION 2c.

The given diagram is a rectangle.

The area of a rectangle is given by the formula

$Area=length \times width$

The length of the rectangle is l=2x cm and the width of the rectangle is w=4 cm .

We substitute the values to obtain the area to be

$Area=2x \times 4$

The expression for the area is

Area=8x

QUESTION 2d

The given diagram is a square.

The area of a square is given by,

Area=l^2 .

where l=b m is the length of one side.

The expression for the area is

Area=b^2 m^2

QUESTION 2e

The given diagram is an isosceles triangle.

The area of this triangle can be found using the formula,

$Area=\frac{1}{2}\times base\times height$ .

The height of the triangle is 4cm .

The base of the triangle is 6a cm .

The expression for the area is

$Area=\frac{1}{2}\times 6a \times 4cm^2$

Area=12a cm^2

QUESTION 3a

Perimeter is the distance around the figure.

Let P be the perimeter, then

P=x+x+x+x

The expression for the perimeter is

P=4x mm

QUESTION 3b

The given figure is a rectangle.

Let P, be the perimeter of the given figure.

P=L+B+L+B

This simplifies to

P=2L+2B

P=2(L+B)

QUESTION 3c

The given figure is a parallelogram.

Perimeter is the distance around the parallelogram

Perimeter=3q+P+3q+P

This simplifies to,

Perimeter=6q+2P

Perimeter=2(3q+P)

QUESTION 3d

The given figure is a rhombus.

The perimeter is the distance around the whole figure.

Let P be the perimeter. Then

P=5b+5b+5b+5b

This simplifies to,

P=20b mm

QUESTION 3e

The given figure is an equilateral triangle.

The perimeter is the distance around this triangle.

Let P be the perimeter, then,

P=2x+2x+2x

We simplify to get,

P=6x mm

QUESTION 3f

The figure is an isosceles triangle so two sides are equal.

We add all the distance around the triangle to find the perimeter.

This implies that,

Perimeter=3m+5m+5m

Perimeter=13m mm

QUESTION 3g

The given figure is a scalene triangle.

The perimeter is the distance around the given triangle.

Let P be the perimeter. Then

P=(3x+1)+(2x-1)+(4x+5)

This simplifies to give us,

P=3x+2x+4x+5-1+1

P=9x+5

QUESTION 3h

The given figure is a trapezium.

The perimeter is the distance around the whole trapezium.

Let P be the perimeter.

Then,

P=m+(n-1)+(2m-3)+(n+3)

We group like terms to get,

P=m+2m+n+n-3+3-1

We simplify to get,

P=3m+2n-1 mm

QUESTION 3i

The figure is an isosceles triangle.

We add all the distance around the figure to obtain the perimeter.

Let be the perimeter.

Then P=(2a-b)+(a+2b)+(a+2b)

We regroup the terms to get,

P=2a+a+a-b+2b+2b

This will simplify to give us the expression for the perimeter to be

P=4a+3b mm.

QUESTION 4a

The given figure is a square.

The area of a square is given by the formula;

Area=l^2

where l=2m is the length of one side of the square.

We substitute this value to obtain;

Area=(2m)^2

This simplifies to give the expression of the area to be,

Area=4m^2

QUESTION 4b

The given figure is a rectangle.

The formula for finding the area of a rectangle is

$Area=l\times w$ .

where l=5a cm is the length of the rectangle and w=6cm is the width of the rectangle.

We substitute the values into the formula to get,

$Area =5a \times 6$

Area =30a cm^2

QUESTION 4c

The given figure is a rectangle.

The formula for finding the area of a rectangle is

$Area=l\times w$ .

where l=7y cm is the length of the rectangle and w=2x cm is the width of the rectangle.

We substitute the values into the formula to get,

$Area =7y \times 2x$

The expression for the area is

Area =14xy cm^2

QUESTION 4d

The given figure is a rectangle.

The formula for finding the area of a rectangle is

$Area=l\times w$ .

where l=3p cm is the length of the rectangle and w=p cm is the width of the rectangle.

We substitute the values into the formula to get,

$Area =3p \times p$

The expression for the area is

Area =3p^2 cm^2

See attachment for the continuation

Answer from: Quest

1. 0.3 •4 is the same as 4 groups of 0.32. 7•0.8 is the same as 7 groups of 0.83. it increases by 0.5 every time, so 0.5x4 it increases by 0.9 every time, so 0.9x5. 0.9•12=10.86. 0.47•5=2.35i can finish the next ones in a separate post
Can someone plz me 1 to 37 . i will earn 10 points

Can someone plz me 1 to 37 . i will earn 10 points

Answer from: Quest

the largest number of the four options is 1.8 x 10-2

you have it in scientific notation.

1.80 x 10-6 = 0.00000180

1.80 x 10-4 = 0.000180 (bigger, or "less small", than the former one)

1.8 x 10-2 = 0.0180. as you see. the "less small", or the biggest one of them all.

as you have negative exponent, it means you are dividing 1.8 by 100 (i.e. moving the dot towards left, two times).

if you had positive exponent for the scientific notation, power of tenths, you would be multiplying times 100 (moving the dot towards right) as below:

1.8 x (10)2 = 180

so. if you have negative exponent in scientific notation, move the dot toward left. if it is positive, toward right as many times the exponent tells you.

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