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3 years ago

8

a store is giving away $10 coupons to every 7th person to enter the store and a $25 coupon to every 18th person too emter the st

ore whick person will be the first to get both coupons

1 answer:

almond37 [142]3 years ago

3 0

7,14,21,28,35,42,49,56,63,70,77,84,91,98,105,112,119,126
18,36,54,72,90,108,126

So the first person to get both of them is the 126th person

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Solve.<br><br> The sum of 7c−5 and the opposite of 7c

Margaret [11]

Answer:

- 5

Step-by-step explanation:

The opposite of 7c is - 7c, thus the sum is

7c - 5 + (- 7c)

= 7c - 5 - 7c ← collect like terms

= - 5

5 0

3 years ago

Read 2 more answers

Hello pls help me guy but pls no random links

lbvjy [14]

Answer: Choice A

Work Shown:

5% of $25 = 0.05*25 = 1.25

4 0

3 years ago

Please help me with precalculus??<br>linear and angular speed

Anit [1.1K]

13)

there are 2π radians in 1 revolution, and there are 60 seconds in 1 minute, so keeping that in mind, then,

$\bf \cfrac{4\underline{\pi} }{5~\underline{s}}\cdot \cfrac{rev}{2\underline{\pi} }\cdot \cfrac{60~\underline{s}}{min}\implies \cfrac{4\cdot 60~rev}{5\cdot 2~min}\implies \cfrac{240~rev}{10~min}\implies 24\frac{rev}{min}$

14)

$\bf \textit{linear velocity}\\\\
v=rw\quad 
\begin{cases}
r=radius\\
w=angular~speed\\
----------\\
v=32\frac{m}{sec}\\
w=100\frac{rev}{min}
\end{cases}\\\\
-------------------------------\\\\
\textit{let's convert \underline{w} to }\frac{radians}{sec}$

$\bf \cfrac{100~\underline{rev}}{\underline{min}}\cdot \cfrac{2\pi }{\underline{rev}}\cdot \cfrac{\underline{min}}{60~sec}\implies \cfrac{100\cdot 2\pi }{60~sec}\implies \cfrac{10\pi }{3~sec}\implies \cfrac{10\pi }{3}\frac{radians}{sec}\\\\
-------------------------------\\\\
v=rw\implies \cfrac{v}{w}=r\implies \cfrac{\frac{30~m}{sec}}{\frac{10\pi }{3~sec}}\implies r=\cfrac{30~m}{\underline{sec}}\cdot \cfrac{3~\underline{sec}}{10\pi }
\\\\\\
r=\cfrac{90}{10\pi }m$

15)

what is the radians per seconds "w" in revolutions per minute? just another conversion like in 13)

$\bf \cfrac{\underline{\pi} }{3~\underline{sec}}\cdot \cfrac{rev}{2\underline{\pi }}\cdot \cfrac{60~\underline{sec}}{min}\implies \cfrac{60 ~rev}{3\cdot 2 ~min}\implies \cfrac{60 ~rev}{6 ~min}\implies 10\frac{rev}{min}$

4 0

4 years ago

What must Sara get on her next test to average 80% if her previous test scores were 78, 88, 83, and 81?

Luba_88 [7]

Answer: 70

Explain:

80*5 = 400
this tells us that the total scores before
dividing must be 400

400 - (78+88+83+81) = 70
this tells us that we lack +70

in conclusion, to get an average of 80% on Sara's test scores; She must receive a grading of 70% in her next test.

8 0

4 years ago

A monomial is defined as. A.the difference of a constant and a variable. B. two terms. C.the sum of a constant and a variable. D

Ronch [10]

D. One term. Mono is a prefix for one.

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3 years ago