All categories

3 years ago

-x + 5y= 30 10x + 6y= 9

Mathematics

1 answer:

Ket [755]3 years ago

6 0

-10x + 50y = 300
10x + 6y = 9

56y = 309
y = 309/56

10x + 6(309/56) = 9
x = -135/56

(-135/56, 309/56)

You might be interested in

The problem is in the picture :)

katrin [286]

I believe it’s 6, so E, but I also believe I’m completely wrong-

6 0

3 years ago

An element with a mass 310 grams decays by 5.7% per minute. How much of the element is remaining after 9 minutes, to the nearest

balu736 [363]

Mass of an element = 310 grams

Percentage of the element that will decay in a minute = 5.7%

Quantity of the element that will decay in one minute :

$= \frac{5.7 \times 310}{100}$

$= \frac{1767}{100}$

$= \tt17.67 \: grams$

Thus, 17.67 grams of the element will decay every minute.

Quantity of element that will decay after nine minutes :

$= 17.67 \times 9$

$=\tt 159.03 \: grams$

Thus, 159.03 grams of the element will decay after 9 minutes.

Quantity of element that will remain after 9 minutes :

$= 310 - 159.03$

$= \tt150.97 \: grams$

Thus, 150.97 grams of the element will remain after nine minutes.

We can round off 150.97 to 151.00.

Therefore, <u>151.00 grams</u> of the element will remain after 9 minutes.

6 0

3 years ago

I'll give you brainlest if you can solve this one! I need STEP, please read the question.

myrzilka [38]

Answer: 1.)= -26 , 2.)= 4 , 3.)= -20 4.)=2 5.)=48 6.)=20 7.)=68 If my answer is correct can you please choose the brainlest. GOOD LESSONS ♡

3 0

3 years ago

Let f(x) = -2x - 7 and g(x) = -4x + 6. Find (fxg)(-5).

OLEGan [10]

Answer:

Step-by-step explanation:

Multiply f(x) and g(x) then evaluate for x = - 5

f(x) × g(x)

= (- 2x - 7)(- 4x + 6) ← substitute x = - 5 into the expression

= (10 - 7)(20 + 6)

= 3 × 26

= 78

7 0

4 years ago

Read 2 more answers

When the radius of a sphere is doubled, what is the resulting change in volume?

jeyben [28]

I think the answer is C

Hope that helped

3 0

4 years ago