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2 years ago

Please simplify –z -10y +2 +15y – 2z -10

Mathematics

2 answers:

Delvig [45]2 years ago

6 0

Answer:

-z-2z-10y+15y+2

-3z+5y+2

Step-by-step explanation:

Sladkaya [172]2 years ago

5 0

Answer:

25y-3z-8

Step-by-step explanation:

happy to help

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3 years ago

A bookcase has two shelves. The top shelf has 10 more than 1/3 the number of books on the bottom shelf. There are 12 books on th

kobusy [5.1K]

Answer: b.14

Step-by-step explanation:

We have two shelves, the top shelf $s_{t}$ and the bottom shelf $s_{b}$ .

Now, firstly we are told the top shelf has 10 more than 1/3 the number of books on the bottom shelf. This can be expressed as:

$s_{t}=10+\frac{1}{3}s_{b}$ (1)

Then, we are told there are 12 books on the bottom shelf:

$s_{b}=12$ (2)

Substituting (2) in (1):

$s_{t}=10+\frac{1}{3}(12)$ (3)

$s_{t}=10+\frac{12}{3}$ (4)

$s_{t}=14$ (5) This is the number of books on the top shelf

Hence, the correct option is b.

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3 years ago

What is 1/2 x 2/3 x 3/4

inna [77]

I believe the answer is 0.25

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3 years ago

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The base of a trinagle is increased by 20% and it’s height is increased by 30%. By what percent is the area of the triangle incr

Molodets [167]

Lets say the base is x and the height is y. The new base would be 1.2x and the new height would be 1.3y

Area of a triangle is base times height divided by 2:

1.2x*1.3y/2 = (1.2*1.3 + x*y)/2 = 1.56xy/2 = 0.78xy = 78% of xy

But a normal area would be 50% of xy

78% - 50% = 38%

ANSWER: 38% increase

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3 years ago

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Mashcka [7]

Step-by-step explanation:

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3 years ago

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