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3 years ago

Please answer. 60 points.

Mathematics

2 answers:

____ [38]3 years ago

8 0

Answer: The models would be P

14.5 would be the answer for part B

Step-by-step explanation:

saul85 [17]3 years ago

7 0

Answer:

Step-by-step explanation:

dont know sorrry

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Q20-23 with steps pls

just olya [345]

20: Let $x$ be the amount of money. If this amount is shared between 8 people, each person will get x/8 dollars. But there actually are 6 people, so everyone is getting x/6 dollars. We know that this difference results in 30 dollars more, so we have

$\dfrac{x}{6}=\dfrac{x}{8}+30 \iff \dfrac{x}{6}-\dfrac{x}{8}=30$

Rearrange the left hand side as

$\dfrac{4x-3x}{24}=30$

And multiply both sides by 24 to get

$x=720$

21: Let $M$ and $J$ be the number of marbles owned by Mike and Judy, respectively. At the beginning, we have

$M=3J+11$

If they both get 9 more marbles, Mike will have $M+9$ marbles, and Judy will have $J+9$ marbles. So, we have

$M+J+18=93 \iff M+J=75 \iff M=75-J$

Plug this value in the first equation and we have

$75-J=3J+11 \iff 4J=64 \iff J=16$

And we deduce

$M=16\cdot 3 + 11=59$

So, the difference is

$M-J=59-16=43$

22: Let $x,y,z$ be the number of $10, $20 and $50 coupon, respectively. We're given:

$\begin{cases}x=2y+3\\z=\frac{1}{2}y\\x+y+z=38\end{cases}
We can write the third equation by substituting the expressions for x and z:
[tex]x+y+z=(2y+3)+y+\left(\dfrac{1}{2}y\right)=38$

Rearrange as follows:

$(2y+3)+y+\left(\dfrac{1}{2}y\right)=38 \iff \dfrac{7}{2}y=35 \iff 7y=70 \iff y=10$

And now we can deduce the number of the other coupons:

$x=2\cdot 10+3=23,\quad z=\dfrac{1}{2}\cdot 10=5$

So, the total value is

$23\cdot 10+10\cdot 20+5\cdot 50=230+200+100=530$

23: a) In order to find the first three terms of the sequence, you just need to plug n=1,2,3:

$a_1=4\cdot 1+3=7,\quad a_2=4\cdot 2+3=11,\quad a_3=4\cdot 3+3=15$

b) We have

$a_r = 4r+3=71 \iff 4r=68 \iff r=\dfrac{68}{4}=17$

c) 105 is a term of the sequence if and only if there exists an integer k such that

$a_k=4k+3=105 \iff 4k = 102 \iff k=\dfrac{102}{4}=25.5$

So, 105 is not a term of the sequence.

8 0

4 years ago

What is the solution of 8 4/5-2/5

Contact [7]

Answer:

You mean 8 whole and 4/5 - 2/5?

It's 8 whole and 2/5 basically.

4 0

3 years ago

1/4 5/8 1/2 least to greatest

eimsori [14]

Answer:

1/4, 1/2, 5/8

Step-by-step explanation:

1/4, 1/2, 5/8

4 0

3 years ago

Read 2 more answers

What’s the answer for ; x-3=6

OLga [1]

Answer:

Step-by-step explanation:

X-3=6

X=6+3

X=9

(Minus becomes plus when we move it to the other side of the equal sign

And plus becomes minus )

Brainliest please!

Hope this helps!

Be my friend!

6 0

4 years ago

Read 2 more answers

Compute 9.3456 + 2140.56. Round the answer appropriately. Express your answer numerically using the proper number of significant

creativ13 [48]

We add the figures given above which would yield to a value 2149.9056. <span>For </span>addition<span> and subtraction, look at the decimal portion (i.e., to the right of the decimal point) of the numbers only. Therefore, the final answer would be 2149.91. Hope this answers the question. Have a nice day.</span>

5 0

3 years ago