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2 years ago

Which choice shows (50 + 20) + 30 correctly rewritten using the associative

Mathematics

1 answer:

MrRissso [65]2 years ago

8 0

Answer:

Step-by-step explanation:

BIDMAS

do the bracket first

50+20=70

70+30=100

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If Sandra practices the piano each day for 2/3 of an hour, how many hours of practice will she get in each week?

dimulka [17.4K]

Answer:

4 2/3

Step-by-step explanation:

2/3 * 7/1

4 2/3

8 0

3 years ago

You have made two of the exact same necklaces that cost you a total of $15 in supplies. You have chosen to mark up the price by

tatyana61 [14]

Answer:

A) The selling price for each necklaces is $8.625

B) The profit mark in each necklaces is 15%

Step-by-step explanation:

Given as :

The total cost of two necklaces = c.p = $15

The markup percentage for the necklaces = m = 15%

Let The selling price for both necklaces = s.p

A ) <u>Now, From markup method</u>

m% = $\dfrac{s.p - c.p}{c.p}$

or, 15% = $\dfrac{s.p - 15}{15}$

or, 15% = $\dfrac{s.p}{15}$ - 1

or, $\dfrac{s.p}{15}$ = 1 + 15%

or, $\dfrac{s.p}{15}$ = 1 + $\dfrac{15}{100}$

or, $\dfrac{s.p}{15}$ = $\dfrac{100 + 15}{100}$

or, $\dfrac{s.p}{15}$ = $\dfrac{115}{100}$

∴ s.p = $\frac{15\times 115}{100}$

I.e s.p = $17.25

So, selling price of two necklaces = s.p = $17.25

or, selling price of one necklaces = s.p = $\dfrac{17.25}{2}$ = $8.625

Hence, The selling price for each necklaces is $8.625

<u>Now, Again</u>

B) ∵ The total cost of two necklaces = c.p = $15

So, The cost price of one necklaces = $\dfrac{15}{2}$ = $7.5

∴ profit% for each necklace = $\dfrac{s.p - c.p}{c.p}$

i.e profit% for each necklace = $\dfrac{8.625 - 7.5}{7.5}$

Or, profit% for each necklace = $\dfrac{1.125}{7.5}$

Or, profit% for each necklace = 0.15

So, The profit make in each necklaces = 15%

Hence, The profit mark in each necklaces is 15%

Answer

8 0

3 years ago

If x varies directly as y, and x = 48 when y = 16, find x when y = 5.

il63 [147K]

X directly varies with y which means as x increases, y also increases. In this case, we represent a constant of proportionality of k.

Applying laws of <span> proportionality,

x =k y
48 = k* 16
k = 3

when y is 5
x = k y
x = 3* 5
x = 15</span>

4 0

3 years ago

Mr. Brown has a board that is 7/8 foot long. He cuts the board into pieces that are 1/16 foot long. Which expression could be us

nika2105 [10]

Answer:

Step-by-step explanation:

8 is half of 16 so times the values by two and you got your answer.

5 0

3 years ago

Solve in C: (3+2i)z+1-2i=2iz-2+i

stellarik [79]

Hello,
(3+2i)z+1-2i=2iz-2+i
<==>(3+2i-2i)z=-2+i-1+2i
<==>3z=3(-1+i)
<==>z=-1+i

5 0

3 years ago