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rjkz [21]
2 years ago
6

Loo at the picture! Need help!

Mathematics
2 answers:
tensa zangetsu [6.8K]2 years ago
7 0
The answer is D
25 + 60i
loris [4]2 years ago
4 0
The correct answer would be D. 25 + 60i

Hope I helped you today :)
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PLZ HELP ME ASAP PLZ PLZ PLZ!!!!! I NEED LOTS OF HELP!!! I USED 40 POINTS
cupoosta [38]
First, some defintions
reciprocals are like a/b and b/a or 5/1 and 1/5

remember, \frac{\frac{a}{b}}{\frac{c}{d}}=(\frac{a}{b})(\frac{d}{c})=\frac{ad}{bc}

john's fraction is reciprocal of sarah's
john=a/b
sarah=b/a

david multiplies his by sarah and gets 12/35
(b/a)(david)=12/35

multplies his number by john and gets 12/35
(a/b)(david)=15/7

hmmm

(b/a)(david)=12/35 and
(a/b)(david)=15/7

if we divide them then we do
\frac{(\frac{b}{a})(david)}{(\frac{a}{b})(david)}=\frac{\frac{12}{35}}{\frac{15}{7}}=
\frac{\frac{b}{a}}{\frac{a}{b}}=\frac{\frac{12}{35}}{\frac{15}{7}}=
(\frac{b}{a})(\frac{b}{a})=(\frac{12}{35})(\frac{7}{15})=
\frac{b^2}{a^2}=\frac{84}{525}=
\frac{b^2}{a^2}=\frac{4}{25}
square root both sides
\frac{b}{a}=\frac{2}{5}

therefor
b=2 and a=5

john's number is a/b=5/2
sarah's number is 2/5

david, hmm

sarah times david=12/35
2/5 times david=12/35
times both sides by 5/2
david=60/70
david=6/7

check other

john times david=15/7
5/2 times 6/7=15/7
30/14=15/7
15/7=15/7
true





sarah's favorite number is 2/5
john's favorite number is 5/2
david's favorite number is 6/7
6 0
3 years ago
Lx + 4l = 7 <br><br> Solve !!
deff fn [24]

Answer:

x1=-11

x2=3

(3,-11)

Step-by-step explanation:

5 0
2 years ago
What is the measure of the angle in degrees? (Write number in answer only)
masha68 [24]

Answer:

it is 35 degrees

Step-by-step explanation:

I am sure of it

8 0
2 years ago
If f(x)=x+1 and g (x)=2x^2-2x-1 what is (gof)(x)
BlackZzzverrR [31]

Answer:

e  

f

∘

g

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=

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x

2

−

4

x

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Step-by-step explanation: f

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−

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3 0
2 years ago
Read 2 more answers
  The length of a rectangle is twice the width. The area of the rectangle is 96 square units. Notice that you can divide the rec
skelet666 [1.2K]

Answer:

The estimate part is D or the square root of 48 and the rectangle is 13.8 units long and 6.9 units wide. Have Fun on Savvas Bro

Step-by-step explanation:

5 0
2 years ago
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