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cestrela7 [59]
4 years ago
13

How to solve equation and justify for -30=-6(r+7)

Mathematics
1 answer:
nexus9112 [7]4 years ago
8 0
Step 1: -30=-6(r+7)
Step 2: -30=-6r+42
Step 3: 6r=42+30
Step 4: 6r= 72
Step 5: r=12


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8 0
3 years ago
Consider the set S={1,2,3,4,5,6,7,8,9,12,13,14,15,16,17,18,19,23,24, .............. ,123456789}, which consists of all positive
jarptica [38.1K]

Answer:

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Step-by-step explanation:

The number of numbers with n digits is the same as the number of combinations of n things taken from 9. That means as many numbers have 5 or more digits as have 4 or fewer, with the exception that the number 123456789 is not matched by the number 0 (or a number with no digits). There are 256 numbers with 5 or more digits, but only 255 with 4 or fewer.

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6 0
4 years ago
How do I multiply at 9/25×1/6
bekas [8.4K]

Answer:

3/50

Step-by-step explanation:

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The scale of a room in a blueprint is 6in : 13ft. A wall in the same blueprint is 9 inches. How long is the actual wall?
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Answer:

Step-by-step explanation:

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3 years ago
A tank contains 3,000 L of brine with 15 kg of dissolved salt. Pure water enters the tank at a rate of 30 L/min. The solution is
Shalnov [3]

Answer:

Step-by-step explanation:

Volume of tank is 3000L.

Mass of salt is 15kg

Input rate of water is 30L/min

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Let y(t) be the amount of salt at any time

Then,

dy/dt = input rate - output rate.

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Now, output rate.

Concentrate on of the salt in the tank at any time (t) is given as

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Then, the solution becomes

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At any time that is the mass.

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3 years ago
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