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3 years ago

Which first step for solving the given system using substitution results in an equation wit

Mathematics

1 answer:

Paraphin [41]3 years ago

8 0

I don’t know if I’m right but I got 2/3 but you should use desmos

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What is the sum and product to this quadratic equation. x^2+7x+2=0

Pani-rosa [81]

I don't know specifically what the sum and product of an equation is but

factor using quadratic formula

if you have an equation in ax^2+bx+c=0 then you can solve for x using

$x= \frac{-b+ \sqrt{b^2-4ac} }{2a}$ or $x= \frac{-b- \sqrt{b^2-4ac} }{2a}$

so input
a=1
b=7
c=2

$x= \frac{-7+ \sqrt{7^2-4(1)(2)} }{2(1)}$
$x= \frac{-7+ \sqrt{49-8} }{2}$
$x= \frac{-7+ \sqrt{41} }{2}$ =aprox -0.2984378812836

$x= \frac{-7- \sqrt{7^2-4(1)(2)} }{2(1)}$
$x= \frac{-7- \sqrt{49-8} }{2}$
$x= \frac{-7 \sqrt{41} }{2}$ =aprox -6.7015621187165

4 0

3 years ago

A certain triangle has two 45 degree angles. what type of triangle is it?

babymother [125]

Answer:

The answer is B. Acute isosceles

6 0

4 years ago

Read 2 more answers

locksmith larry charges $90 for a house cal plus $20 per hour. Locksmith Barry charges $50 for a house call plus $30 per house.

nadya68 [22]

Answer:

4 hours

Step-by-step explanation:

Equations :

Larry : y = 20x + 90

Barry : y = 30x + 50

Equate both to find the number of hours at which they both charge the same :

20x + 90 = 30x + 50
30x - 20x = 90 - 50
10x = 40
x = 4 hours

4 0

3 years ago

Suppose it takes John 41 minutes to run 4 miles. How long would it take him to run 8 kilometers? Round your answer to the neares

Pani-rosa [81]

Answer:

51 minutes!

Step-by-step explanation:

Hello there fellow human!

First off, you convert kilometers to miles.

1 kilometer = 0.62 miles; therefore, 8 kilometers = 8*0.62 = 4.96 miles

Next, you determine how many minutes it takes for John to cover 1 mile

which is gotten by dividing 41 by 4;

41 / 4 = 10.25. So it takes 10.25 minutes to cover 1 mile. (minutes per mile)

Next, you multiply the number of minutes taken to cover 1 mile (10.25) by 4.96 miles (8 kilometers), 10.25 * 4.96 = 50.84 minutes. Rounding that to the nearest minute, you get 51 minutes which make sense because the amount of time taken to cover 4 miles (41 minutes) will be shorter than the time taken to cover 4.96 miles (50.84 minutes) since 4 miles is smaller than 4.96 miles. DIRECT PROPORTION

All calculations where done with a calculator. If you don't have that, you can always divide manually and convert to fraction.

7 0

3 years ago

88% of what number is 66?

AleksAgata [21]

Let the unknown number be x
88% * x= 66 (divide both sides by 88%)
x= 66/88%
x= 75
Therefore the answer is A) 75

5 0

4 years ago

Read 2 more answers