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Margaret [11]
3 years ago
9

Help me (WILL GIVE BRAINLIEST)

Mathematics
1 answer:
blsea [12.9K]3 years ago
4 0

Answer:

9.

1/3 has have the same denominator as 9. making that 3/9. 3/9 plus 6/9 equals 9/9 which also equals 1. 6 plus 2 is 8, and 8 plus 1 is 9

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What is the slope of the line passing through the points (2, 5) and (-2 , 4)?
katovenus [111]
<span><span>Slope (m) =0.25</span><span>θ </span><span>
</span><span>ΔX =-4
</span><span>ΔY =<span>-1</span></span></span>
3 0
3 years ago
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What would be the volume of the pyramid? Little help please
murzikaleks [220]

Answer:

36

Step-by-step explanation:

The answer is 36, I did the work

7 0
3 years ago
Carlos is a boat dealer who bought a sailor for 11,400 and sold it for 12,711 what percent was his markup on a boat
dangina [55]
So we have 11400 +11400×x=12711
this represents the original price plus some percentage of the original price is equal to the new price. now all we need to do is solve for x
so 11400+11400x=12711
subtract 11400 from each side
11400x=1311 now divide both sides by 11400
x=.115 or about 12%
we can. check by finding 12% of the original price.
11400×.12=1368
now add to 11400
11400+1368=12768 so we are a bit over. this is because it is actually 11.5% just depends on how accurate your answer needs to be
6 0
3 years ago
The half-life of cesium-137 is 30 years. Suppose we have a 20 mg sample.
Tju [1.3M]

Answer:

(a) A = (20mg)/(2^(t/30))

(b) 12.6mg

(c) 129.6years

Step-by-step explanation:

To calculate the amount remaining after a number of half-lives, n, we can make use of:

A = \frac{B}{2^n}

Where A = amount remaining

B = initial amount

n = \frac{t}{t_{0.5}}

(a) A = (20mg)/(2^(t/30))

(b) Mass after 20years

A = (20mg)/(2^(20/30)) ≈ 12.6mg

(c) After how long will only 1mg remain:

1mg = (20mg)/(2^(t/30))

20mg = {2^{\frac{t}{30}}

Taking log of both sides we have:

Log(20) = (t/30)log(2)

t/30 = (log(20))/(log(2)) ≈ 4.3

t/30 = 4.3

t = 30 x 4.3 ≈ 129.6years.

8 0
3 years ago
How can I use the percent equation???Ex.what number is 40% of 500???and can u solve this one,too.:45 is 25% of what number???THA
HACTEHA [7]
I've been waiting for someone to ask this question.  It's one of my favorite questions to answer.

percent means out of 100 so 1% = 1/100 and 40%=40/100 or 1/25
so for percent of a number, 'of' means multiply so 40% of 500= 40/100 times 500 or 20000/100 or 200



if you multiply a fraction by its recipricol (the number fliped upside down) the you will get 1 so if you multiply 1/2 by 2/1 then you will get 1

thus
percent is out of 100 so 1%=1/100  25%=25/100
if you represent 45 out of something as 45/x then you multiply it by the reciprocal of the fraction that is supposed to be equal (1/2 =2/4) then you will get 1
so 45/x times reciprocal of 100/25 then you will get 1/1 or 4500/25x
so you divide to find x and get 180
so 45 is 25% of 180


The following is extra
   as stated above 'of' can be taken as multiply so
   45 is 25% of 180 can be rewriten as
   45=25/100 times 180
   but we don't know that 180 is the answer so we replace it with x then            solve for x
4 0
3 years ago
Read 2 more answers
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