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Brums [2.3K]
3 years ago
7

81 is 45% of what number

Mathematics
1 answer:
andrew-mc [135]3 years ago
8 0
81 is 45% of 180, all you do is divide 81 by .45 and boom there you go
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if the edwards drive 225 miles, which company would be a better deal? if the edwards only have to spend, which company would be
VikaD [51]

i can give you the exact answer to your question, but what are the equations for the companies and  how much do the edwards have to spend? if not, here's how to do it:

y= m(225)+b for each company. i used slope-intercept form assuming that's what form the equations are written in. it's basically saying x=225 in part a (look for the lowest y) and in part b y≥m(225)+b (look for which company's equation makes the statement true)

(ps i'm checking every few minutes if you want to comment and get the exact answer)

3 0
2 years ago
Find the zeros of y=x^2-6x-4
Evgen [1.6K]
X=3+√13, 3-√13

substitute y for 0 and solve for x
4 0
2 years ago
PLS HELP ME!!!!! IT IS TIMED
Leni [432]

Answer:

C. 13

Step-by-step explanation:

3 0
2 years ago
Read 2 more answers
2r+2s=50<br> Please look at the picture
lidiya [134]

2r + 2s = 50

2r - s = 17

-----------subtract

3s = 33

s = 11

2r - s = 17

2r - 11 = 17

2r = 28

r = 14

so r = 14 and s = 11

answer is C. r = 14, s = 11

4 0
2 years ago
What are the exact solutions of x2 − 5x − 7 = 0, where x equals negative b plus or minus the square root of b squared minus 4 ti
Marat540 [252]

Answer:

x = \frac{5 + \sqrt{53}}{2}  or  x = \frac{5 - \sqrt{53}}{2}

Step-by-step explanation:

Given

x^2 - 5x - 7 = 0

Required

Solve for x using:

x = \frac{-b \± \sqrt{b^2 - 4ac}}{2a}

First, we need to identify a, b and c

The general form of a quadratic equation is:

ax^2 + bx + c = 0

So, by comparison with x^2 - 5x - 7 = 0

a = 1     b = -5      c = -7

Substitute these values of a, b and c in

x = \frac{-b \± \sqrt{b^2 - 4ac}}{2a}

x = \frac{-(-5) \± \sqrt{(-5)^2 - 4 * 1 * -7}}{2 * 1}

x = \frac{5 \± \sqrt{25 +28}}{2}

x = \frac{5 \± \sqrt{53}}{2}

Split the expression to two

x = \frac{5 + \sqrt{53}}{2}  or  x = \frac{5 - \sqrt{53}}{2}

To solve further in decimal form, we have

x = \frac{5 + 7.28}{2}  or  x = \frac{5 - 7.28}{2}

x = \frac{12.28}{2}  or  x = \frac{-2.28}{2}

x = 6.14 or x = -1.14

4 0
3 years ago
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