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3 years ago

Write an expression for "the sum of d and 9

Mathematics

1 answer:

mixer [17]3 years ago

3 0

Answer:

Sum means to ADD in the math world

Step-by-step explanation:

So your answer would be d + 9

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The first term in a geometric series is 64 and the common ratio is 0.75. Find the sum of the first 4 terms in the series.

maks197457 [2]

Answer:

195.25

Step-by-step explanation:

Consider geometric series S(n) where initial term is a

So S(n)=a+ar^1+...ar^n

Factor out a

S(n)=a(1+r+r^2...+r^n)

Multiply by r

S(n)r=a(r+r^2+r^3...+r^n+r^n+1)

Subtract S(n) from S(n)r

Note that only 1 and rn^1 remain.

S(n)r-S(n)=a(r^n+1 -1)

Factor out S(n)

S(n)(r-1)=a(r^n+1 -1)

The formula now shows S(n)=a(r^n+1 -1)/(r-1)

Now use the formula for the problem

4 0

3 years ago

The average customer waiting time at a fast food restaurant has been 7.5 minutes. The customer waiting time has a normal distrib

tatuchka [14]

Answer: C . $H_0:\mu\geq7.5$ and $H_a:\mu$

Step-by-step explanation:

Definition:

Null hypothesis $(H_0)$ is a statement about the population parameter according to the objective raised by the researcher . It contains '=' , '≤' and '≥' signs.

Alternative hypothesis $(H_a)$ is also a statement about the population parameter but against null hypothesis . It contains '≠' , '<' and '>' signs.

Let $\mu$ be the average customer waiting time for the population.

Given : The average customer waiting time at a fast food restaurant has been 7.5 minutes.

Objective of test : After using new system , the average customer waiting time is at least 7.5 or less than 7.5.

Then, the null and alternative hypothesis for this scenario will be :

$H_0:\mu\geq7.5$

$H_a:\mu$

4 0

4 years ago

Solve for base. 450 crates is 0.90% of ___ crates

Tema [17]

Well... if 450 is 90% of the crates then 500 is 100%. 450 crates is 0.90% of 500 crates.

8 0

3 years ago

Write the expression 2 3/5 as a radical.

vitfil [10]

<span>Write the expression 2 3/5 as a radical.

</span> $2^{ \frac{3}{5}}= \sqrt[5]{2^3}$ <span>
</span>

6 0

3 years ago

How do you solve You earn 15n 15n dollars for mowing n lawns. How much do you earn for mowing one lawn? Seven lawns?

Rudik [331]

Answer:

$15 for a lawn, $105 for seven lawns.

Step-by-step explanation:

The question is about the direct ratio problem. Logically, you will earn more if you mow more lawn.

The scheme for this ratio is given below:

15 n_________n lawns

x_________ 1 lawn

$x=\frac{15n*1}{n} = 15$

You will earn 15 dollars for mowing a lawn

When you mow 7 lawns, the scheme will be in this manner:

15 n__________n lawns

x__________7 lawns

$x=\frac{15n*7}{n}=105$

You will earn 105 dollars

8 0

3 years ago