3 years ago

82+42 using mental math with associative property

1 answer:

5 0

82
+42
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124
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You're welcome! Hope this helped!

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1÷1+cosa+1÷1_cos a please solve question

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ok so THIS IS UR ANSWER I THINK PLEASE MAKE ME BRAINLIEST

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3 years ago

Write an equation for each sentence 13 times the sum of a number and 5<br> is 91<br> I

Volgvan

Answer:13( n + 5) = 91

Step-by-step explanation: solve the parenthesis first and then multiply that by 13

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3 years ago

NEED HELP ON THIS ASAP

stich3 [128]

Answer:

a: 3

b: 12

c: 15

Step-by-step explanation:

12 + 15 = 27

There are 27 total.

Since there are 27 in all, it's best if each small rectangle value is 3.

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3 years ago

13 mm<br> 17 mm<br> What would the area of the triangle

Bad White [126]

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110.5mm

Step-by-step explanation:

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3 years ago

The half-life of Radium-226 is 1590 years. If a sample contains 200 mg, how many mg will remain after 1000 years?

adell [148]

Answer: 129.33 g

Step-by-step explanation:

$$$Let $p=A \cdot e^{n t}$ \\$(p=$ present amount, $A=$ initial amount, $n=$ decay rate, $t=$ time)$

$\begin{aligned}&\Rightarrow \text { Given } p=\frac{A}{2} \ a t \ t=1590 \\&\Rightarrow \frac{1}{2}=e^{1590n} \Rightarrow n=\frac{\ln (1 / 2)}{1590}=-0.00043594162\end{aligned}$

$If $A=200 \mathrm{mg}$ and $t=1000$ then,$$\begin{aligned}P &=200 e^{\left(\frac{\ln \left(1/2\right)}{1590}\right) \cdot 1000} \text \\\\&=129.33 \text { grams}\end{aligned}$

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2 years ago