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2 years ago

Which is an equation for the given word problem?

Mathematics

1 answer:

allsm [11]2 years ago

6 0

The answer is D. She would have to do 20+n=225.50.

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You have a supplementary angle. If angle A is 161 degrees, what is the degree measure of angle B? *

LuckyWell [14K]

Answer:

Angle B=19°

Step-by-step explanation:

Hope this helps u...

8 0

3 years ago

Find the discriminant, and determine the number of real solutions. then solve x^2 +8x+20=0

vodomira [7]

Answer:

Part 1) The quadratic equation has zero real solutions

Part 2) The solutions are

$x_1=-4+2i$ and $x_2=-4-2i$

Step-by-step explanation:

we know that

The formula to solve a quadratic equation of the form $ax^{2} +bx+c=0$ is equal to

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

in this problem we have

$x^{2}+8x+20=0$

$a=1\\b=8\\c=20$

The discriminant is equal to

$D=(b^{2}-4ac)$

If D=0 -----> the quadratic equation has only one real solution

If D>0 -----> the quadratic equation has two real solutions

If D<0 -----> the quadratic equation has two complex solutions

<em>Find the value of D</em>

$D=8^{2}-4(1)(20)=-16$ -----> the quadratic equation has two complex solutions

<em>Find out the solutions</em>

substitute the values of a,b and c in the formula

$x=\frac{-8(+/-)\sqrt{8^{2}-4(1)(20)}} {2(1)}$

$x=\frac{-8(+/-)\sqrt{-16}} {2}$

Remember that

$i=\sqrt{-1}$

$x=\frac{-8(+/-)4i} {2}$

$x_1=\frac{-8(+)4i} {2}=-4+2i$

$x_2=\frac{-8(-)4i} {2}=-4-2i$

8 0

3 years ago

Quiz

ivanzaharov [21]

Answer: Its A, Your Welcome.

Step-by-step explanation:

4 0

3 years ago

A single card is selected from a deck. find the probability that it is a queen or a black card.

s2008m [1.1K]

52 cards in a deck. 4 of those are queens. 52/2=26 (total # of black cards), 2 red queens. Total + of cards you could possibly draw as the favored car = 28 out of 52...,

This is where i lose the probability. It's greater than 50%. I hope this helps.

8 0

3 years ago

A cross-country travels 20 kilometers before she realizes that she has to cover at least 75 kilometers in order to qualify for t

valina [46]

It will be 7 hour and 30 min

5 0

3 years ago

Read 2 more answers