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blondinia [14]
3 years ago
7

What is the common difference in this equation? f(n) = 7n + 2

Mathematics
1 answer:
alekssr [168]3 years ago
7 0
The common difference is 2
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HELP meeeeee please
Rufina [12.5K]

Answer: a = 23, b = 21, c = 136

Step-by-step explanation:

8 0
3 years ago
If you place a cup of 210 degree Fahrenheit coffee on a table in a room that is 68 degrees fareinheit, and ten minutes later, it
Lana71 [14]
Newton's Law of Cooling

Tf=Ts+(Ti-Ts)e^(-kt)   where Tf is temp at time t, Ts is temp of surroundings, Ti is temp of object/fluid.  So we need to find k first.

200=68+(210-68)e^(-10k)

132=142e^(-10k)

132/142=e^(-10k)

ln(132/142)=-10k

k=-ln(132/142)/10

k≈0.0073  so 

T(t)=68+142e^(-0.0073t)  so how long until it reaches 180°?

180=68+142e^(-0.0073t)

112=142e^(-0.0073t)

112/142=e^(-0.0073t)

ln(112/142)=-0.0073t

t= -ln(112/142)/(0.0073)

t≈32.51 minutes


8 0
3 years ago
Describe the relationship between two variables when the correlation coefficient r is one of the following. (a) near –1 strong
zepelin [54]

Answer:

a) strong negative linear correlation.

b) Weak or no linear correlation.

c) strong positive linear correlation.

Step-by-step explanation:

The correlation coefficient r measures the strength and direction (positive or negative) of two variables. The correlation coefficient r is always between -1 and 1. When the coefficient r is negative then the direction of the correlation is downhill (negative) and when it's positive then it's an uphill correlation (positive). Similarly, as the coefficient is closer to -1 or 1 the correlation is stronger, with zero being a non linear relationship.

Now back to the question:

a) Near -1: as we said before, this means an strong negative (-1) linear correlation.

b) Near 0: weak or no linear correlation (we cannot say if its positive or negative because we don't know it it's near zero from the right (positive numbers) or the left (negative numbers)

c) Near 1: strong positive (close to +1) linear correlation

3 0
3 years ago
an electronics store sells large flat screen tvs for 1699 last month the store sold 8 of this tvs anout how much did the tvs sel
rusak2 [61]
The answer is $212.37 for each large flatscreen tv
4 0
3 years ago
Is a theater there are 28 rows in each row there are 32 seats, each ticket coasts £19.75
DedPeter [7]

Answer:

£17696

Step-by-step explanation:

28*32= 896

896*19.75= 17696

7 0
3 years ago
Read 2 more answers
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