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never [62]
3 years ago
10

(7x+3)(x-9) need help

Mathematics
1 answer:
Natalka [10]3 years ago
8 0
7x^2-63x+3x-27=0

Simplify. 

7x^2-60x-27=0

To find value of x, 7x+3=0
x-9=0 

x1=-3/7
x2=9

Substitute back in equation to find the answer either x1 or x2
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Yesterday Annie walked 9/10 mile to her friends house.together to he library which is the best estimate for how far Annie walked
Novay_Z [31]
1. 9/10 + 9/10 =18/10 = 1 8/10 = 1 4/5
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3 years ago
Please help!<br><br> If sin(xº)=cos(yº) find k if x=2k+3 and y=6k+7
USPshnik [31]

answer

10

step-by-step explanation

the equation given is sin(x) = cos(y) with x = 2k + 3 and y = 6k + 7

substitute in 2k+ 3 for x in sin(x) and substitute in 6k + 7 for y in cos(y)

sin(x) = cos(y)

sin(2k + 3) = cos(6k + 7)

we know that sin(x) = cos(90 -x)

sin(2k + 3)

= cos(90 - (2k + 3) )

= cos(90 - 2k - 3)

= cos(87 - 2k)

substitute this into the equation sin(2k + 3) = cos(6k + 7)

sin(2k + 3) = cos(6k + 7)

cos(87 - 2k) = cos(6k + 7)

87 - 2k = 6k +7

80 = 8k

k = 10

7 0
3 years ago
Angad, Caroline and Sarah share some sweets in the ratio 7:4:3. Angad gets 52 more sweets than Sarah. How many sweets does Carol
padilas [110]
A = 7x, c = 4x, s = 3x

a = s+52
7x = 3x+52
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x = 13

c = 4x = 52
Caroline gets 52.
7 0
3 years ago
Simplify the expression b+2/b^2-4
Lubov Fominskaja [6]
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8 0
3 years ago
Read 2 more answers
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ra1l [238]

Answer:

0.236

Step-by-step explanation:

Multiply 0.4 by 0.59

hopes this helps have a good day :) <3

brainlest???

5 0
3 years ago
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