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2 years ago

Help, I’ll give brainliest, explain

Mathematics

1 answer:

Irina18 [472]2 years ago

5 0

Answer:

A 48

D 0

O 7.5 (fraction form: 7 1/2)

E 21

Next line

E 34

N 36.8 (fraction form: 36 4/5)

L 9

T 8

Step-by-step explanation:

A (a)(c)

A (12)(4)

A 48

D 48 - (a + c)

D 48 - (12 + 4)

D 48 - 48

D 0

O (5a)/8

O 5(12)/8

O 60/8

O 7.5

E (ab)/c

E (12)(7)/(4)

E 84/4

E 21

Next line

E 2b + 5c

E 2(7) + 5(4)

E 14 + 20

E 34

N c(9.2)

N 4(9.2)

N 36.8

L 72/2c

L 72/2(4)

L 72/8

L 9

T (2/3)a

T (2/3)(12)

T 8

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Please Answer Attachment Below Thanks

docker41 [41]

Answer:

Step-by-step explanation:

The interior angles of a heptagon add up to 5*180 = 900

x + 143 + 116 + 135 + 135 + 116 + 155 = 900 Add up the known angles

x + 800 = 900 Subtract 800 from both sides

x + 800 - 800 = 900 - 800 Combine

x = 100

8 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