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Varvara68 [4.7K]
4 years ago
13

Write an equation to find how long it will take for the mass of the radioactive substance to reach 27grams.

Mathematics
1 answer:
kiruha [24]4 years ago
3 0

were are the answer choices

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Rename 2/5 as a percent_______________________
loris [4]

It can be helpful to remember that "%" is just a shorthand way to write "/100" (divided by 100, or per 100, or per cent). ("Cent" is often used to refer to 100 or 1/100. A "cent" is 1/100 of a dollar, or 1/100 of an acre, for example. A <em>cent</em>ury is 100 years.)

Make the denominator of your fraction be 100. Multiply numerator and denominator by 20/20.

(2/5)×(20/20) = 40/100 = 40%

You can also get there via decimals.

... 2/5 = 0.4 = 0.40 (40 hundredths) = 40/100 (40 hundredths) = 40%

Or, you can multiply by 100%.

... (2/5)×(100%) = (200/5)% = 40%

7 0
3 years ago
J+2 = 3k+5 in terms of k
leonid [27]

Answer:

(j-3)/3 =k

Step-by-step explanation:

j+2 = 3k+5

Solve for k

Subtract 5 from each side

j+2-5 = 3k+5-5

j-3 = 3k

Divide each side by 3

(j-3)/3 = 3k/3

(j-3)/3 =k

5 0
3 years ago
A parking space shaped like a parallelogram has a base of 17 feet and a height is 9 feet. A car parked in the space is 16 feet l
timama [110]
Ok, so we have to find areas and subtract

area=legnth times widht or base times height

parking space area=17 times 9=153
car=16 times 6=96


subtract
153-96=57
answer is 57 ft^2
4 0
3 years ago
Read 2 more answers
In a batch of 890 calculators, 12 were found to be defective. What is the probability that a calculator chosen at random will be
jarptica [38.1K]
890 times 12 equals 10680
4 0
3 years ago
Isabella uses one-foot cubical blocks to build a rectangular fort that is 12 feet long, 10 feet wide, and 5 feet high. The floor
jonny [76]

Answer:

12

trust me it works i just took the test.

5 0
3 years ago
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