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3 years ago

Help,please,thankyou

Mathematics

2 answers:

vladimir2022 [97]3 years ago

8 0

the answer is D not c

cause try it then see

Pavel [41]3 years ago

6 0

Answer:

Step-by-step explanation:

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if the marked price of a watch is 25 % above the cost price. by what percentage the cost price is less than the marked price

Paha777 [63]

Answer:

logically cp =25%less than mp

7 0

3 years ago

What is the total cost, in dollars, to have the logo painted on the office building?

Murljashka [212]

15 squares + 15 squares =30 then you times 2.25 times 30 to get 67.5 the you do the other side 11 squares + 11 squares=22 squares then you times 22 squares by 2.25 and you get 49.5 then you add the 67.5+49.5=117

it would cost $117 to paint that.

6 0

3 years ago

How do I solve this

Veronika [31]

Answer:

P(A or B) = 1.16

Step-by-step explanation:

Given probability:

Probability of event A = P(A) = 0.46

Probability of event B = P(B) = 0.7

P(A and B) = 0.43

Find:

P(A or B)

Computation:

If A is an incident and B is a separate event, P(A or B) is the possibility of either A, B, or both events occurring.

P(A or B) = P(A) + P(B)

P(A or B) = 0.46 + 0.7

P(A or B) = 1.16

5 0

3 years ago

Half-life of Po-210 is 140 days. If the initial mass of the sample is 5

Anna35 [415]

Answer:

$0.625kg$

Step-by-step explanation:

we are given half-life of PO-210 and the initial mass

we want to figure out the remaining mass after 420 days

in order to solve so we can consider the half-life formula given by

$\displaystyle f(t) = a {0.5}^{t/T}$

where:

f(t) is the remaining quantity of a substance after time t has elapsed.
a is the initial quantity of this substance.
T is the half-life

since it halves every 140 days our T is 140 and t is 420. as the initial mass of the sample is 5 our a is 5

thus substitute:

$\displaystyle f(420)=5\cdot{0.5}^{420/140}$

reduce fraction:

$\displaystyle f(420)=5\cdot{0.5}^{3}$

By using calculator we acquire:

$\displaystyle f(420)=0.625$

hence, the remaining sample after 420 days is 0.625 kg

4 0

3 years ago

Why do we use letters in mathematics?

icang [17]

We use letters to substitute for unknown numbers. I hope this helps. :)

3 0

3 years ago

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Help,please,thankyou ​

Help,please,thankyou