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-Dominant- [34]
3 years ago
10

Which of the following expressions are equivalent to this expression:

Mathematics
2 answers:
tatyana61 [14]3 years ago
8 0

Answer:

A: -1[4+(-4)]

Gekata [30.6K]3 years ago
6 0

The original expression is equal to 0 because anything multiplied by 0 is equal to 0. Solve inside the brackets for the possible answer choices to find what will equal 0.

Start with the first expression. Add 4 and negative 4 will become 0, and -1 times 0 is equal to 0. Let's solve for the others just to be sure.

In the second expression, solving inside the brackets gives you 8. -1 times 8 is equal to -8.

Adding 4 and negative 4 in the third expression leaves you with 0. But, 1 + 0 is equal to 1.

Adding negative 4 and negative 4 gives you the answer of -8, and -1 times -8 is equal to 8.

Your answer is the first expression, or A.

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Answer:

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3 years ago
George and Paul use a metal alloy that is 18.1% copper to make jewelry. How many ounces of an alloy that is 14% copper must be m
ella [17]

Answer:

Use 49 ounces of the 14% allow and 41 ounces of the 23% alloy.

Step-by-step explanation:

Each ounce of the 14% copper contains 0.14 ounce of pure copper.

Each ounce of the 23% copper contains 0.23 ounce of pure copper.

Each ounce of the 18.1% copper contains 0.181 ounce of pure copper.

Use x ounces of the 14% and y ounces of the 23% to make 90 ounces of 18.1% alloy.

x+y  = 90

y = 90-x

0.14x + 0.23y = 0.181·90

0.14x + 0.23(90-x) = 16.29

0.14x + 20.7 - 0.23x = 16.29

-0.09x + 20.7 = 16.29

4.41 = 0.09x

x = 49

y = 90-x = 41

Use 49 ounces of the 14% allow and 41 ounces of the 23% alloy.

7 0
3 years ago
Developed nations make up about percent of the world s population and consume about percent of its resources.
Pepsi [2]
The answer is A, developed nations make up about 20 percent of population yet consume 75 percent of sources.
6 0
3 years ago
Help me with problems 13 ,14 and 15
Tamiku [17]
|2.5| because 2 and 1/2 are also 2.5 written in decimal, and the absolute value is always positive
8 0
3 years ago
Determine the amount you need to invest to have $22,000 dollars in 4 years if you invest at 5% annual interest, compounded quart
zvonat [6]

Answer:


Step-by-step explanation:

Метод

сложных процентов:

S = 100 (1+

0,10/2)^2*2 = 100*1,2155

= 121,55

ΔР = 121,55

– 100 = 21,55 тыс. руб.

6 0
3 years ago
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