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3 years ago

Letty answered 15 out of 20 questions correctly on her history quiz. What is her grade as a percent?

Mathematics

2 answers:

andriy [413]3 years ago

8 0

Answer:

Letty has 75%

Step-by-step explanation:

15/20 is the same as 75/100 ( 15/20·5) so she has a 75% grade

grin007 [14]3 years ago

6 0

Answer: 75%

Step-by-step explanation:

you can do 15 over 20 or 15 divided by 20 which will give you .75

move the decimal to the right two times and you get 75%

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Put these numbers in order from least to greatest.<br><br> 1/8,1/2,0.13, and 7/8

Alex73 [517]

Answer: 1/8, 0.13, 1/2, 7/8

Step-by-step explanation: Mental Math

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3 years ago

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£60 is divided between Peter, Angad & Nick so that Peter gets twice as much as Angad, and Angad gets three times as much as

Anna [14]

60£

Peter = 2 Angard

Angard = 3 Nick

Peter = 2 Angard = 6 Nick

Angard = 3 Nick

Nick = 1 Nick

6+3+1=10 Nick

60£/10 = 6£

Nick = 6£

Angvard = 3 Nick = 6£*(3) = 18£

Peter = 6 Nick = 6£*(6) = 36£

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3 years ago

Each solid is composed of a rectangular prism and a regular prism. Find the surface area of the solid.

Amanda [17]

1345 is answer but not sure

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3 years ago

Prove the divisibility of the following numbers:

Brut [27]

Answer:

Step-by-step explanation:

To prove divisibility, we need to factor the divident such that one of its factors matches the divisor.

(I use the notation x|y to denote that x divides y)

(A)

$75^{30}|45^{45}\cdot15^{15}\\45^{45}\cdot15^{15}=3^{45}\cdot 15^{45}\cdot 15^{15}=\\=3^{45}\cdot 15^{60}=3^{45}\cdot 15^{30}\cdot 15^{30}=3^{45}\cdot (3\cdot5)^{30}\cdot 15^{30}=\\=3^{45}\cdot 3^{30}\cdot(5\cdot 15)^{30}=3^{45}\cdot 3^{30}\cdot(75)^{30}\\\implies\\75^{30}|3^{45}\cdot 3^{30}\cdot75^{30}$

(B)

$72^{63}|24^{54}\cdot 54^{24}\cdot2^{10}\\24^{54}\cdot 54^{24}\cdot2^{10}=(2^{162}\cdot 3^{54})\cdot(2^{24}\cdot 3^{72}) \cdot 2^{10}\\=2^{196}\cdot 3^{126}$