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Zepler [3.9K]
3 years ago
9

Please answer only questions 18 and 20 please help me ​

Mathematics
2 answers:
PolarNik [594]3 years ago
7 0
You do 8 x 7 answer divided by 7 answer times by 8 for 18
olga nikolaevna [1]3 years ago
4 0

Answer:

18 is 64 days

20 is 1 37/128

Step-by-step explanation:

I looked it up if I am being completely honest with you but it should be correct

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Veronica has been saving dimes and quarters and has a total of 86 coins worth $9.00. How many
taurus [48]
The answer to your question is 4.11 if I’m correct
8 0
2 years ago
A teenager’s heart pumps an average of 7200 L of blood every 24 hours. What is the rate of change of volume of blood?
love history [14]

Answer:

300L per hour

Step-by-step explanation:

The rate of change of volume of blood pumped by the teenager's heart expresses the volume of blood pumped with respect to hour.

Rate of change of volume of blood = \frac{volume of blood}{time}

                           = \frac{7200L}{24}

                           = 300L/hour

The rate of change of volume of blood by the teenager's heart is 300 litres per hour. This implies that his/ her heart pumps 300 litres of blood every hour.

7 0
3 years ago
Which statement best describes the solution to this system of equations?
kondaur [170]

Answer:

x=-3

y=26

Step-by-step explanation:

3 0
3 years ago
Brett golfs for the forestville knights high school team. When he practices his putting, he can make a 10-foot putt 80% of the t
balu736 [363]
The formula to calculate standard deviation from probability is \sqrt(n*p*(1-p)). n is the sample size, and 200 in this case (number of putts for practice). p is 80% or 0.8, the probability that he can make it. So the standard deviation is \sqrt(200*0.8*(1-0.8)=\sqrt(200*0.8*0.2)=\sqrt(16)=4.
4 0
3 years ago
Find the value of f(-1) for the function below
mrs_skeptik [129]

Put the value of x = -1 to the equation of a function f(x):

f(x)=\dfrac{2}{3}\times3^{3x+12}\\\\f(-1)=\dfrac{2}{3}\times3^{3(-1)+12}=\dfrac{2}{3}\times3^{-3+12}=\dfrac{2}{3}\times3^9=\dfrac{2}{1}\times3^8=13,122\to\boxed{B.}

8 0
3 years ago
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