I really need help!!

Mathematics

1 answer:

ololo11 [35]2 years ago

3 0

Answer:

the second one ............,.................................................................

You might be interested in

Write a numerical expression for each phrase. Then simplify and

SVETLANKA909090 [29]

Answer:6

Step-by-step explanation:

8 0

2 years ago

Read 2 more answers

Erik drives 19.2 miles in 16 minutes.

Katen [24]

Answer:

Erik's average speed exceeds the speed limit by 6.91 miles per hour.

Step-by-step explanation:

Let suppose that Erik travels at constant speed. Hence, the speed ( $v$ ), measured in miles per hour, is determined by following equation of motion:

$v = \frac{s}{t}$ (1)

Where:

$s$ - Distance, measured in miles.

$t$ - Time, measured in hours.

Please notice that a hour equals 60 minutes. If we know that $s = 19.2\,mi$ and $t = 0.267\,h$ , then the speed of Erik is:

$v = \frac{19.2\,mi}{0.267\,h}$

$v = 71.910\,\frac{mi}{h}$

Which is 6.91 miles per hour above the speed limit.

6 0

2 years ago

What is cos theta when sin theta = sqrt 2/3

Fittoniya [83]

Answer:

Value of cosθ is ±√7/3 .

Step-by-step explanation:

According to the Question , value of :

$\red{\implies sin\theta = \dfrac{\sqrt2}{3}}$

And , we know the identity of sine and cosine as ,

$\boxed{\pink{\sf\implies sin^2\theta + cos^2\theta = 1} }$

Using , this identity we have ;

$\implies sin^2\theta + cos^2\theta = 1 \\\\\implies \bigg( \dfrac{\sqrt2}{3}\bigg)^2 + cos^2\theta = 1 \\\\\implies \dfrac{2}{9} + cos^2\theta = 1 \\\\\implies cos^2\theta = 1 - \dfrac{2}{9} \\\\\implies cos^2\theta = \dfrac{9-2}{9} \\\\\implies cos\theta = \sqrt{\dfrac{7}{9}} \\\\\underline{\boxed{\blue{\bf \implies cos\theta = \pm \dfrac{\sqrt 7 }{3}}}}$