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2 years ago

Describe how you regroup when you find the sum of 64+43

2 answers:

8 0

To regroup, you simply break up the bigger numbers into smaller numbers that are more easily added together. We often regroup numbers into numbers that end with 0 because they're easier to add. For example, you can break up 64into 60+4 and 43 into 40+3. This will make addition easier, because you can first add together 60 and 40, which is equal to 100. Then, you can add the smaller digits 100+4+3=107.

Paul [167]2 years ago

7 0

You don’t need to regroup

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If cos 65 degree +cos 55 degree = cos θ, find θ in radians

belka [17]

We have to find t(theta) in radians.
cos t = cos 65° + cos 55°
We know that:
cos x + cos y = 2 · cos (x+y)/2 · cos (x - y)/2
cos t = 2 · cos (65°+55°)/2 · cos (65°-55°)/2
cos t = 2 · cos 60°· cos 5°
cos t = 2 · 1/2 · cos 5°
cos t = cos 5°
t = 5° = π/36 radians

7 0

2 years ago

Sean and his sister, Betty equally mow 8/9th the total area of a lawn. What fraction of the total area did each of them mow? (Sh

Alexxx [7]

Since they mowed $\frac{8}{9}$ of the lawn in two equal parts, we need to split the pieces that were mowed into two equal groups. We know that in total they mowed 8 out of the total 9 pieces of lawn, so two equal groups that make 8 would be of size 4, since $\frac{8}{2}=4$ . Then they each mowed $\frac{4}{9}$ of the lawn.

8 0

2 years ago

Capucine played a game where she earned 179 points from building 11 museums and 4 libraries. She earns 4 more points per museum

Korolek [52]

Capucine played a game where she earned 179 points from building 11 museums and 4 libraries.

Lets assume x points she earn per library

She earns 4 more points for museum than library.

4 more points per museum per x . so the points earned per museum is x+4

she earned 179 points from 11 museums and 4 libraries.

So the equation becomes

$11 (x+4) + 4x = 179$

$11x +44 + 4x = 179$

$15x + 44 = 179$ ( subtract 44 from both sides)

$15x= 135$ (divide by 15 from both sides)

x = 9

She earns 9 points per library

We know points per museum = x+4 = 9+4 = 13

She earns 13 points per museum .

5 0

2 years ago

15) Bob has 12 black pen, 14 red pen, 15 green pens, 24 blue pens and 3 boxes of

cricket20 [7]

Answer:

13, 16, 18

Step-by-step explanation:

Sabemos que podemos calcular el total de plumas amarillos, por medio de la media.

16 = (12 + 14 + 15 + 24 + x + y + z) / 7

16 * 7 = 12 + 14 + 15 + 24 + x + y + z

112 = 65 + x + y + z

x + y + z = 112-65

x + y + z = 47

sabemos que la mediana es el valor medio, y que ese 46 debe dividirse entre 3 valores porque son 3 cajas, entonces debemos buscar los números adecuados para el valor 15 esté en la mitad, es decir de cuarto.

Sin meter los valores nuevos, el ranking sería así:

el 15 esta de tercero, para que quede de cuarto, debe tener dos valores por debajo y un por arriba, así:

Por lo tanto, valores mayores a 15 serían por ejemplo y = 16 y z = 18:

16 + 18 = 34

x = 47-34 = 13

quedaría:

dieciséis

18 años

Si recalculamos la media:

m = (12 + 14 + 15 + 24 + 13 + 16 + 18) / 7 = 16

8 0

2 years ago

Is the expression x3•x3•x3 equivalent to x3•3•3? Why or why not? Explain your reasoning.

Sunny_sXe [5.5K]

If the first expression reads x(cube) • x(cube) • x(cube) and x(cube • cube • cube), then the answer is no. They are not equal.

x(cube) • x(cube) • x(cube) will be equivalent to x(to the 9th power) while x(cube • cube • cube) will be equivalent to x( to the 27th power).

3 0

2 years ago