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LenKa [72]
3 years ago
15

Gloria scored 75, 76, and 77 on the first three math tests. What score does she need on test #4 so that the mean of her scores w

ill be 80?​
Mathematics
1 answer:
skelet666 [1.2K]3 years ago
5 0

Answer:

77%

Step-by-step explanation:

(75+76+77+80) / 4 = 77

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How do u guys solve this?
enyata [817]
Just graph it in the calculator
6 0
3 years ago
A radioactive substance decays at a continuous rate of 12% per year, and 90 mg of the substance is present in the year 2000. (a)
Alla [95]

Answer:

A(t) = 90e^0.12t ;

299 mg

Step-by-step explanation:

General Continous growth rate equation :

A = Pe^rt

A = amount present, t years after year of initial amount.

Here,

P = 90 mg, amount in year 2000

r = rate = 12% = 0.12

t = years after 2000

Therefore,

A is written as ;

A(t) = 90e^0.12t

Amount present in year 2010 ;

t = 2010 - 2000 = 10

A(10) = 90e^0.12(10)

A(10) = 90 * e^1.2

= 90 * 3.3201169

= 298.81052

= 299 mg

5 0
2 years ago
Which of the following does NOT describe a rational number? A- Non-repeating decimal B- Perfect square (ex: square root of 4) C-
alexandr1967 [171]

Answer:

Non-repeating decimal

Step-by-step explanation:

As a example, 32.93729, would be a never ending number. Which means it's not a rational number, it is a irrational number.

6 0
3 years ago
Read 2 more answers
Ali is paid $200 for working 8 hours.How much is he paid for working 6 hours?​
artcher [175]

Answer:

$150

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
Write an addition problem that has 9/10 as the sum
kicyunya [14]
There are a number of different problems that you could do that will give you an outcome of 9/10
For example, 1/2 and 2/5 add up to 9/10.
3/10 and 6/10 also add up to 9/10.

Find the sum of 7/10 and 1/5
Find the sum of 7/20 and 11/20
Find the sum of 1/2 and 3/10 and 1/10
Find the sum of 1/5 and 2/5 and 3/10

Hope this helps :) 
3 0
3 years ago
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