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GenaCL600 [577]

3 years ago

9

You bought 5 folders that each cost x dollars, a calculator for $45, and a set of pens for $3 ( write an expression in simplest

form that equals the total amount)

1 answer:

lilavasa [31]3 years ago

7 0

5x+45+3

if there is a total amount, equal this to the total amount and get the number of dollars spent on each folder which is x

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Find the common ratio of the geometric sequence -13, 117, -1053,...

Oksanka [162]

Answer:

-9

Step-by-step explanation:

Find the common ratio by dividing one of the numbers in the sequence by the previous number:

117/-13

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So, the common ratio is -9.

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3 years ago

Initially 100 milligrams of a radioactive substance was present. After 8 hours the mass had decreased by 2%. If the rate of deca

4vir4ik [10]

Answer:

The half life of the radioactive substance is 277 hours.

Step-by-step explanation:

initial mass, No = 100 mg

mass decayed = 2% = 2 mg

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time, t = 8 hours

Let the half life is T.

Use the equation of radioactivity

$N = No\times e^{\frac{-0.693 t}{T}}\\\\98 = 100 \times e^{\frac{-0.693\times 8}{T}}\\\\0.98 = e^{\frac{-5.54}{T}}\\\\ln 0.98 = -\frac{5.54}{T}\\\\-0.02= -\frac{5.54}{T}\\\\T = 277 hours$

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3 years ago

Grayson took a math quiz last week. He got 29 problems correct and 29 problems incorrect. What percentage did Grayson get correc

Nana76 [90]

Answer:

50%

Step-by-step explanation:

29 right and 29 wrong. 29+29=58

Divide 29 by 58 and you get .5

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in Mr. Perron's class, 60% of the students are boys. There are 18 boys in the class. What is the total number of students in Mr.

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I hope this helps :)

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4 years ago

What's the product of 42⁄3 and 111⁄4 ?

Fofino [41]

Change the mixed numbers to the impropert fractions:

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4 0

4 years ago