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Schach [20]
3 years ago
8

Are 4x and 15 + x equivalent expressions? EXPLAIN I need help FAST!

Mathematics
1 answer:
mina [271]3 years ago
3 0

Answer:

x=5

Step-by-step explanation:

Step 1: you want to have x alone on one side so I will subtract one x from both sides (to remove the 1 x on the right side). Now we're left with 3x=15.

Step 2: Divide both sides by 3 (to remove the 3 in front of 3x). Now we have x=5.

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The weight of a tree is doubling every 3 years and how many years will be way of the tree be 1600% of its weight now
BARSIC [14]
Doubling every 3 years, meaning 200% every 3 years.

1600 \div 200 = 8
8 \times 3 = 24
The answer is 24 years.

Hope this helps. - M
6 0
3 years ago
Beaker A contains 1 liter which is 30 percent oil and the rest is vinegar, thoroughly mixed up. Beaker B contains 2 liters which
alekssr [168]

Answer:

1.25 liters of oil

Step-by-step explanation:

Volume in Beaker A = 1 L

Volume of Oil in Beaker A = 1*0.3 = 0.3 L

Volume of Vinegar in Beaker A = 1*0.7 = 0.7 L

Volume in Beaker B = 2 L

Volume of Oil in Beaker B = 2*0.4 = 0.8 L

Volume of Vinegar in Beaker B = 1*0.6 = 1.2 L

If half of the contents of B are poured into A and assuming a homogeneous mixture, the new volumes of oil (Voa) and vinegar (Vva) in beaker A are:

V_{oa} = 0.3+\frac{0.8}{2} \\V_{oa} = 0.7 \\V_{va} = 0.7+\frac{1.2}{2} \\V_{va} = 1.3

The amount of oil needed to be added to beaker A in order to produce a mixture which is 60 percent oil (Vomix) is given by:

0.6*V_{total} = V_{oa} +V_{omix}\\0.6*(V_{va}+V_{oa} +V_{omix}) = V_{oa} +V_{omix}\\0.6*(1.3+0.7+V_{omix})=0.7+V_{omix}\\V_{omix}=\frac{0.5}{0.4} \\V_{omix}=1.25 \ L

1.25 liters of oil are needed.

6 0
3 years ago
Match the expressions to their solutions or equivalents. -1/9 / (-1/3)
Zepler [3.9K]

The quotient of the given expression is 1/3

<h3>Difference and division of fractions</h3>

Fractions are written as a ratio of two integers

Given the expression below'

-1/9 / (-1/3)

Change the division to multiplication

-1/9 * -3/1

1/9 * 3/1

1/3

Hence the quotient of the given expression is 1/3

Learn more on fractions here: brainly.com/question/78672

#SPJ1

8 0
2 years ago
To the nearest whole number, what is the surface area of a sphere with a volume of 140 cm3?
lara [203]
The answer should be 130 cm2
7 0
4 years ago
Read 2 more answers
Find the value of r in the following diagram.
Andrews [41]

Answer:

r = 6.7

Step-by-step explanation:

9²-6²=45

√45=6.7

3 0
3 years ago
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