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vaieri [72.5K]
3 years ago
7

Reba needs to simplify the expression below. 6 and one-half + 3.5 times 2 minus 7 divided by 3 Which operation should she perfor

m first? addition subtraction multiplication division
Mathematics
2 answers:
Alexxandr [17]3 years ago
8 0

Answer:

Multiplication

Step-by-step explanation:

Multiplication should be the first step Reba needs to do to simplify the expression. This is according to PEMDAS, which is an acronym for the order to solve equations

Parentheses

Exponents

Multiplication

Division

Addition

Subtraction

natka813 [3]3 years ago
3 0

Answer:

  • multiplication

Step-by-step explanation:

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The half life of silicone-32 is 710 years. If 30 grams is present now, how much will be present in 300 years?
Irina18 [472]

Answer:

22.38 g of silicone-32 will be present in 300 years.

Step-by-step explanation:

A radioactive half-life refers to the amount of time it takes for half of the original isotope to decay and its given by

                                           N(t)=N_0(\frac{1}{2})^{\frac{t}{t_{1/2}}

where,

N(t) = quantity of the substance remaining

N_0 = initial quantity of the substance

t = time elapsed

t_{1/2} = half life of the substance

From the information given we know:

  • The initial quantity of silicone-32 is 30 g.
  • The time elapsed is 300 years.
  • The half life of silicone-32 is 710 years.

So, to find the quantity of silicone-32 remaining we apply the above equation

N(t)=30\left(\frac{1}{2}\right)^{\frac{300}{710}}=30\left(\frac{1}{2}\right)^{\frac{30}{71}}\approx22.38 \:g

22.38 g of silicone-32 will be present in 300 years.

7 0
3 years ago
Find the value of x. 55
Katena32 [7]

Answer:

90 - 55 = 35

its 35

Step-by-step explanation:

4 0
3 years ago
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Answer:

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Step-by-step explanation:

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6 0
3 years ago
What expression are equivalent 4^-32/4^2?
pickupchik [31]
4^32=22.627417 and 4^2=16

5 0
3 years ago
Consider the function represented by the equation y - x - 4 = 0. What is the equation written in function notation, with x as
PtichkaEL [24]

Answer:

f(x) = x + 4

Step-by-step explanation:

Given

y - x - 4 = 0 ( add x to both sides )

y - 4 = x ( add 4 to both sides )

y = x + 4 ( let y = f(x) )

f(x) = x + 4

3 0
3 years ago
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