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Andreas93 [3]
3 years ago
6

Someone help me please!!?? I don’t understand please

Mathematics
1 answer:
lisabon 2012 [21]3 years ago
5 0
Use PEMDAS so do (-3/2) first. and then rewrite it and keep doing pemdas
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URGENT will give brainliest!!! Element X decays radioactively with a half life of 5 minutes. If there are 540 grams of Element X
yKpoI14uk [10]

Answer:

7.2 minutes

Step-by-step explanation:

The formula to find the time using the radioactive decay rate formula is given as:

t = t½ × In(Nt/No)/-In2

Where

t½ = half life = 6 minutes

No = Initial Amount = 260 grams

Nt = Amount after decay

= 113 grams

Hence:

t = 6 × In(113/260)/-In2

t = 7.2131331036796 minutes

Approximately = 7.2 minutes

7 0
2 years ago
What is the area of this shape?
suter [353]

Step-by-step explanation:

There are four quarter circles, each with radius 9 ft.  Together, they form a full circle.  There are also four squares, each with side length 9 ft.

A = πr² + 4s²

A = π (9 ft)² + 4 (9 ft)²

A ≈ 578.469 ft²

6 0
3 years ago
What is the sum of 6 feet 10 inches and 8 feet 9 inches?
vivado [14]
Lets first convert everything to inches.

6 feet= 12*6 = 72 + 10 = 82 inches
8 feet= 12*8 = 96+9 =  105 inches

Now add!

82+105 = 187

Now convert them back to feet.

187/12 = 15 feet

12*15 = 180

187 - 180 = 7 inches

15 feet. 7 inches. 

Final answer: B. 15 ft. 7 in.
6 0
3 years ago
Read 2 more answers
Convert: 106 mi = ________ km
Bond [772]
1 km=0.621mi
xkm=106 mi
x=106/0.621=170.66
b is the answer
6 0
3 years ago
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If twice a number, added to 3 is divided by the number plus 5, the result is three halves. Find the number.
Lynna [10]

Answer:2

Step-by-step explanation:

(2x+5)/3 = 3/2

Multiply both sides by 3:

2x + 5 = 9/2

Subtract 5 from both sides:

2x = 9/2 - 5 = 9/2 - 10/2 = 3/2

Divide both sides by :

x = 3/4

7 0
2 years ago
Read 2 more answers
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