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3 years ago

What is mental mathematics

Mathematics

2 answers:

timurjin [86]3 years ago

7 0

Doing math in your head - being able to work out a math problem without writing it down

taurus [48]3 years ago

6 0

<span>It is the ability's to work sum in your head is an important skill primary students must develop throughout the key stages.
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HELP

kaheart [24]

Answer:

We find the perimeter using the distance formula between two points.

1) A(2, -4), B(-2, -1), C(-5, -5), D(-1, -8)

AB = $\sqrt{(x_2-x_1)^{2}+(y_2-y_1)^{2}}$

= $\sqrt{(-2-2)^{2}+(-1+4)^{2} }$

= $\sqrt{25}$

= 5 units

Similarly, BC = 5 units

CD = 5 units

AD = 5 units

Perimeter = AB+BC+CD+AD = 20 units (E)

2) X(-2, 1), Y(4, 3), Z(5, -1)

XY = $\sqrt{(x_2-x_1)^{2}+(y_2-y_1)^{2}}$

= $\sqrt{(4+2)^{2}+(3-1)^{2} }$

= √40 = 6.3

Similarly, YZ = √17 = 4.1

XZ = 7.3

Perimeter = XY+YZ+XZ = 17.7 units (C)

3) A(0, 4), B(4, 1), C(4, -4), D(-4, -4), E(-4, 1)

AB = $\sqrt{(x_2-x_1)^{2}+(y_2-y_1)^{2}}$

= $\sqrt{(4-0)^{2}+(1-4)^{2} }$

= √25 = 5 units

BC = 5 units

CD = 8 units

DE = 5 units

AE = 5 UNITS

Perimeter = 28 units (B)

4) . T(-5, 0), U(7, 3), V(9, -6), W(-3, -9)

TU = $\sqrt{(x_2-x_1)^{2}+(y_2-y_1)^{2}}$

= $\sqrt{(7+5)^{2}+(3-0)^{2} }$

= √153 = 12.4 units

UV = 9.2 units

VW = 12.4 units

TW = 9.2 units

Perimeter = 43.2 units (D)

5) S(-1, 6), T(-1, -8), U(7, -8)

ST = $\sqrt{(x_2-x_1)^{2}+(y_2-y_1)^{2}}$

= $\sqrt{(-1+1)^{2}+(-8-6)^{2}}$

= 14 units

TU = 8 units

SU = 16.1 units

Perimeter = 38.1 units (A)

6) A(-7, 0), B(-3, 5), C(2, 1), D(-2, -4)

AB = $\sqrt{(x_2-x_1)^{2}+(y_2-y_1)^{2}}$

= $\sqrt{(-3+7)^{2}+(5-0)^{2}}$

= 6.4 units units

BC = 6.4 units

CD = 6.4 units

AD = 6.4 units

Perimeter = 25.6 units (F)

6 0

3 years ago

What’s the slope to (-5,5) (5,-4)

Lena [83]

Answer:

Step-by-step explanation:

(-5,5)...x1 = -5 and y1 = 5

(5,-4)...x2 = 5 and y2 = -4

slope = (y2 - y1) / (x2 - x1)

slope = (-4 - 5) / (5 - (-5) = -9 / (5 + 5) = -9/10 <==

6 0

3 years ago

quick question heh.... How do you know when to use the Secant-Secant Prodict Theorem or the Secant-Tangent Product Theorem?

Vaselesa [24]

You use the theorem you can apply to your problem.

If there is no tangent, the secant-tangent product theorem cannot apply.
If you don't have two secants, the secant-secant product theorem cannot apply.

6 0

4 years ago

PLZZZ HELP NEEDED ASAP WILL GIVE BRAINLIEST (IF RIGHT)

Tema [17]

Answer:

x=18.5

y=37

Step-by-step explanation:

90+2y+16=180

106+2y=180

2y=74

y=37

16+4x+90=180

106+4x=180

4x=74

x=18.5

4 0

3 years ago

Read 2 more answers

Which property can you use to show that 3x + (2x + 4) is equivalent to (3x + 2x) + 4?

atroni [7]

Answer:

Associative Property

Step-by-step explanation:

3x + (2x + 4) is equivalent to (3x + 2x) + 4

because there is no change of signs taking place as there is no (-) sign in front of the brackets

3x + (2x + 4) | (3x + 2x) + 4

3x + 2x + 4 | 3x + 2x +4

5x + 4 | 5x + 4

4 0

4 years ago