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2 years ago

What is f(−3) for the function f(a)=−2a2−5a+4?

Mathematics

2 answers:

Gnesinka [82]2 years ago

7 0

Step-by-step explanation:

please mark me as brainlest

AleksAgata [21]2 years ago

6 0

Step-by-step explanation:

Hope it's helpful for you

pls mark above guy ans as brainliest

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Two bicyclists are 7/8 of the way through a mile long tunnel when a train approaches the closer end at 40 mph. The riders take o

Anastaziya [24]

Answer:

the cyclists rode at 35 mph

Step-by-step explanation:

Assuming that the cyclists stopped, and accelerated instantaneously at the same speed than before but in opposite direction , then

distance= speed*time

since the cyclists and the train reaches the end of the tunnel at the same time and denoting L as the length of the tunnel :

time = distance covered by cyclists / speed of cyclists = distance covered by train / speed of the train

thus denoting v as the speed of the cyclists :

7/8*L / v = L / 40 mph

v = 7/8 * 40 mph = 35 mph

v= 35 mph

thus the cyclists rode at 35 mph

6 0

3 years ago

What is the anserw to round to the nerst hunder with 872

katrin2010 [14]

900. You round up, because it is above 850. :-)

5 0

2 years ago

I need help with this question!!!! Given directed line segment QS, find the coordinates of R such that the ratio of QR to RS is

bagirrra123 [75]

Answer:

2.6

Step-by-step explanation:

5 0

2 years ago

PLEASE HELP. I AM TRULY STUMPED.

maks197457 [2]

So, let's say you have -5, the opposite of that is 5,opposite numbers always have the sum of 0, just are something about money where you have 2 opposite numbers

7 0

2 years ago

Using the quadratic formula to solve x2 + 20 = 2x, what are the values of x?

jeka94

by Quadratic formula , $x^2 + 20 = 2x$ , values of x are $x = 1 \pm (1)i\sqrt{19}}$ . None of mentioned options are correct according to question!

Step-by-step explanation:

Here we have , expression x2 + 20 = 2x or , $x^2 + 20 = 2x$ .

We know that Quadratic formula is :

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

$x^2 + 20 = 2x$

⇒ $x^2-2x+20=0$

$a=1\\b=-2\\c=20$

Putting this value in equation $x = \frac{-b \pm \sqrt{b^{2}-4ac}}{2a}$ :

⇒ $x = \frac{-b \pm \sqrt{b^{2}-4ac}}{2a}$

⇒ $x = \frac{-(-2) \pm \sqrt{(-2)^{2}-4(1)(20)}}{2(1)}$

⇒ $x = \frac{2 \pm \sqrt{4-80}}{2}$

⇒ $x = (\frac{2 \pm 2i\sqrt{19}}{2})$

⇒ $x = 1 \pm (1)i\sqrt{19}}$

Therefore , by Quadratic formula , $x^2 + 20 = 2x$ , values of x are $x = 1 \pm (1)i\sqrt{19}}$ . None of mentioned options are correct according to question!

7 0

2 years ago