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3 years ago

Can some one help me with this please. I will give you anything if you get this right.

Mathematics

2 answers:

Nuetrik [128]3 years ago

6 0

help with what? there's nothing here

Natasha_Volkova [10]3 years ago

4 0

Answer:

I will try to answer once you give a screenshot not a download pdf...

Step-by-step explanation:

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Pls help! Will mark Branliest!! 50 points for whoever answers!!!!!!

KiRa [710]

Answer: See below

Step-by-step explanation:

Isolate x for x-2y+2z=9

3x=9+2y

$x=\frac{9+2y}{3}$ ....(1)

Substitute (1) into the 2nd equation

$\begin{bmatrix}-\frac{9+2y}{3}+3y=-4\\ 2\cdot \frac{9+2y}{3}-5y+3z=16\end{bmatrix}$

$\frac{3\left(-9+7y\right)}{3}=3\left(-4\right)$

7y=-3

y=-3/7

Substitute y=-3/7

$\begin{bmatrix}3z+\frac{18-11\left(-\frac{3}{7}\right)}{3}=16\end{bmatrix}$

$\begin{bmatrix}3z+\frac{53}{7}=16\end{bmatrix}$

Isolate z by substituting it

$3z+\frac{53}{7}=16$

$\frac{3z}{3}=\frac{\frac{59}{7}}{3}$

$z=\frac{59}{21}$

For x =9+2y/3 substitute z=59/21 and y=-3/7

$x=\frac{9+2\left(-\frac{3}{7}\right)}{3}$

$x=\frac{19}{7}$

$x=\frac{19}{7},\:z=\frac{59}{21},\:y=-\frac{3}{7}$

6 0

3 years ago

Read 2 more answers

3. The cone below is intersected by a

Ann [662]

Answer:

It depends were you are looking from but there is shows D. Oval so ig thats

the answer

6 0

3 years ago

Jules reads that i pint is equivalent to 0.473 he asks his teacher how many liters are in one pint .His teacher responds that th

sleet_krkn [62]

Answer:

Yes

Step-by-step explanation:

4 0

3 years ago

How many solutions does 5z - 8 – 7 = -4741 have?

N76 [4]

Answer:

unknown

Step-by-step explanation:

z is an unknown number

6 0

3 years ago

A round trip from Montreal to LA is 2,688 miles and takes an airline 9 hours and 20 minutes. Given the outbound trip is the same

Ksju [112]

Answer:

4.074 hours

Step-by-step explanation:

r =

The formula for speed = Distance × Time

Hence,

Let the outbound speed = r

return trip speed = r + 25x/100 = 125r/100 = 1.25r

Note that: 9 hours and 20 minutes = 9.167

Let t1 and t2 be the time taken to travel on way and return journey.

t1 + t2 = 9 hr 10 min = 9.167 hrs

Hence:

2688/r + 2688/1.25r = 9.167

LCM(1.25r)

(2688 × 1.25) + 2688 /1.25r= 9.167

3360 + 2688 = 9.167 × 1.25r

6048 = 11.45875r

r = 6048/11.45875

Outbound trip rl = 527.8062615904876mph

Return trip speed = r + 25x/100 = 125r/100 = 1.25r

= 1.25 ×

659.75782699mph

Time for return trip = Distance/Speed

= 2,688 miles/659.75782699mph/

= 4.0742222222 hours

Approximately = 4.074 hours

8 0

3 years ago