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3 years ago

Which shows the correct way to evaluate 20 – 10 ÷ (2 + 3) + 1?

Mathematics

1 answer:

Rashid [163]3 years ago

5 0

Answer:

Step-by-step explanation:

In pic

(Credit:Symbolab)

(Hope this helps can I pls have brainlist (crown)☺️)

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The quotient if 4÷7 is a decimal number.How many digits in the quotient are overlined

Licemer1 [7]

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Hope this helps!

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3 years ago

Answer for points 3(3x3)(45x6)(45x7)(56x5)(5x5)x0

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Answer:

Step-by-step explanation:

3(3x3)(45x6)(45x7)(56x5)(5x5)x0 =0

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3 years ago

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3 years ago

Half-life of Po-210 is 140 days. If the initial mass of the sample is 5

Anna35 [415]

Answer:

$0.625kg$

Step-by-step explanation:

we are given half-life of PO-210 and the initial mass

we want to figure out the remaining mass after 420 days

in order to solve so we can consider the half-life formula given by

$\displaystyle f(t) = a {0.5}^{t/T}$

where:

f(t) is the remaining quantity of a substance after time t has elapsed.
a is the initial quantity of this substance.
T is the half-life

since it halves every 140 days our T is 140 and t is 420. as the initial mass of the sample is 5 our a is 5

thus substitute:

$\displaystyle f(420)=5\cdot{0.5}^{420/140}$

reduce fraction:

$\displaystyle f(420)=5\cdot{0.5}^{3}$

By using calculator we acquire:

$\displaystyle f(420)=0.625$

hence, the remaining sample after 420 days is 0.625 kg

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3 years ago

Which shows the correct way to evaluate 20 – 10 ÷ (2 + 3) + 1?​

Which shows the correct way to evaluate 20 – 10 ÷ (2 + 3) + 1?