3 years ago

(+×9)(×-2) can some one solve it

Mathematics

1 answer:

marshall27 [118]3 years ago

4 0

X2 - 2x + 9x - 18
X2 + 7x - 18

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Find the value of 4x2 + 2y where y= 0.5 and x= 3

Citrus2011 [14]

Answer:

Step-by-step explanation:

substitute the given values for x and y into the expression

4x² + 2y

= 4(3)² + 2( $\frac{1}{2}$ )

= 4(9) + 1

= 36 + 1

= 37

7 0

3 years ago

1.Arsenic-74 is used to locate brain tumors. It has a half-life of 17.5 days. 90 mg wereused in a procedure. Write an equation t

Sophie [7]

$1)\text{ }N_t\text{ = 90\lparen}\frac{1}{2})^{\frac{t}{17.5}}$

2) 5.625 mg will be left

Explanation:

1) Half-life = 17.5 days

initial amount of Arsenic-74 = 90 mg

To get the equation, we will use the equation of half-life:

$\begin{gathered} N_t\text{ = N}_0(\frac{1}{2})^{\frac{t}{t_{\frac{1}{2}}}} \\ where\text{ N}_t\text{ = amount remaining} \\ N_0\text{ = initial amount} \\ t_{\frac{1}{2}\text{ }}\text{ = half-life} \end{gathered}$ $N_t\text{ = 90\lparen}\frac{1}{2})^{\frac{t}{17.5}}$

2) we need to find the remaining amount of Arsenic-74 after 70 days

t = 70

$\begin{gathered} N_t=\text{ 90\lparen}\frac{1}{2})^{\frac{70}{17.5}} \\ N_t\text{ = 5.625 mg} \end{gathered}$

So after 70 days, 5.625 mg will be left

4 0

1 year ago

Hey I need some help!! Does anyone mind giving me the answers and explain how? I really don’t understand. PS the question is in

Ksenya-84 [330]

Answer:

2x2x2x5

Step-by-step explanation:

2x2x2x5 equals 40

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3 years ago

Please help my small brain understand this:

antoniya [11.8K]

Answer

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Step-by-step explanation:

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3 years ago

−1/2(7z+4)+1/5(5z−15)

Tanya [424]

Answer:

Step-by-step explanation:

-7z/2 - 2 + z -3

=-5 - 5z/2

5 0

3 years ago