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borishaifa [10]
3 years ago
10

PLEASE HELP I WILL MARK YOU BRAINLIEST Carleen and Dianaliz are collecting rocks for a science experiment. They go out hiking fo

r two weekends in a row! The first weekend the girls collected 312 pounds of rocks on Saturday and 234 pounds of rocks on Sunday. The next weekend the girls collected 615 pounds of rocks on Saturday and 113 pounds of rocks on Sunday. How many more pounds of rocks were collected for their experiment during their second weekend of hiking compared to their first weekend of hiking?*
Mathematics
1 answer:
Karo-lina-s [1.5K]3 years ago
6 0

Answer:

The girls collected 182 pounds of rocks more the second weekend of hiking compared to the first weekend of hiking.

Step-by-step explanation:

312 + 234 = 546

615 + 113 = 728

728 - 546 = 182

182 lbs

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Statement D. is true

Step-by-step explanation:

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-2.7+17.8+29.5+8.9=?
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64.5

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QUICK EASY 25 POINTS!!
MAVERICK [17]

Answer:

1. leave the radical symbol and don't try to convert it to a decimal form

2. The approximated value differs from the exact solution and doesn't give a true equation.

3. Depending on the case, if she needs a mathematical answer, the exact value should be used, but for more practical applications, the rounded decimal form would be more usable.

Step-by-step explanation:

The step by step solution to the equation:

4x^3=756\\x^3=\frac{756}{4} =189\\x=\sqrt[3]{189} \\x=\sqrt[3]{3^3*7} \\x=3*\sqrt[3]{7}

1.- Exact solution means that if in the final step when solving for x the value of  x^3 is not a perfect cube, one needs to leave it indicated as a radical expression (with the radical symbol).

in our case, the cubic root of 189 is not a perfect cube. The factor form of 189 is: 3^3*7, so there is a perfect cube factor (3^3), but the other factor (7) is a prime number. Therefore 3 can get out of the root, while 7 stays inside.

2.- The equation was solved above, in exact form. Now to solve it giving a decimal approximation, we use a calculator to find the cubic root of 7, which is an irrational number with infinite number of decimals, the first of which we type here: \sqrt[3]{7} = 1.91293118...

Therefore, the decimal approximation to the solving for x would be:

x=3*\sqrt[3]{7}=3*1,91293118...=5.73879...=5.74

Where we rounded to two decimals as requested.

When we replace the exact answer in the original expression, we get a perfect equality:

4*x^3=756\\4* (3\sqrt[3]{7} )^3=756\\4*3^3*(\sqrt[3]{7} )^3=756\\4*27*7=756\\\\756=756

While if we use the approximate answer, we get:

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7 0
3 years ago
-0.312 as a fraction in simplest form
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Answer:

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Rewrite the decimal number as a fraction with 1 in the denominator

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Therefore

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In conclusion,

−0.312=−39/125

4 0
3 years ago
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