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3 years ago

Tom rolls 2 fair dice and adds the results from each. Work out the probability of getting a total that is a factor of 21.

Mathematics

1 answer:

nika2105 [10]3 years ago

5 0

Answer:

3 plus 4. and 2 plus 1. or 4 plus 3 or 1 plus 2

Step-by-step explanation:

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What is equivalent to(x+8)(x-7)

ziro4ka [17]

Hi there!

To multiply, we need to use f.o.i.l:

(x + 8)(x - 7)
= x * x - 7 * x + 8 * x - 8 * 7
= x^2 - 7x + 8x - 56
= x^2 + x - 56

Hope this helps!

7 0

3 years ago

A . 5 - 4/8<br> B. -1/8 - 1/4<br> C. -1/4 - (-1/8)<br> or D. -1/6 + (-5/24)

xenn [34]

Answer:

letter ( D ).

1/6 + ( - 5 / 2 4 )

7 0

2 years ago

the area of a square whose sides have length x cm is increasing at the rate of 12cm²/s. how fast is the length of a side increas

katovenus [111]

Answer:

0.67 cm/s

Step-by-step explanation:

The area of a square is given by :

$A=x^2$ ....(1)

Where

x is the side of a square

$\dfrac{dA}{dt}=12\ cm^2/s$

Differentiating equation (1) wrt t.

$\dfrac{dA}{dt}=2x\times \dfrac{dx}{dt}$

When A = 81cm², the side of the square, x = 9 cm

Put all the values,

$12=2\times 9\times \dfrac{dx}{dt}\\\\\dfrac{dx}{dt}=\dfrac{2}{3}\\\\\dfrac{dx}{dt}=0.67\ cm/s$

So, the length of the side of a square is changing at the rate of 0.67 cm/s.

4 0

2 years ago

How to compare rates and ratios

Leviafan [203]

Ratios don't have to be "per" something, while rates are "per" something.

Ratios compare 2 or more values, as well as rates.

6 0

3 years ago

Find the surface area of the regular pyramid shown to the nearest whole number. plz help

Sav [38]

The surface area of the regular hexagonal pyramid is
SA = (1/2) pl + B
where p is the perimeter of the base, l is the slant height of the pyramid, and B is the area of the base
The area of a regular hexagon is 3 sh
where s is the length of the side and h is the length of the apothem.
So,
SA = (1/2)(6)(12) (11) + 3(12)(6sqrt3)
SA = 770 square meters

5 0

3 years ago

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