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3 years ago

CAN SOMEONE PLEASE HELP ME!!!!!

Mathematics

1 answer:

USPshnik [31]3 years ago

8 0

Answer:

Step-by-step explanation:

2{5x²-15+(-9xy²)}-(2y²+4x-xy²)+3x²

=2{5x²-15-9xy²}-(2y²+4x-xy²)+3x²

=10x²-30-18xy²-2y²-4x+xy²+3x²

=13x²-2y²-17xy²-4x-30

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The quantities xxx and yyy are proportional. xxx yyy 111111 1\dfrac{2}{9}1 9 2 1, start fraction, 2, divided by, 9, end fracti

jolli1 [7]

Question:

The quantities x and y are proportional.

$x\ \ \ \ \ \ \ \ \ \ y \\1\frac{2}{9}\ \ \ \ \ \ \ 2\frac{1}{3}$

Find the constant of proportionality (r)

Answer:

$r = 1\frac{10}{11}$

Step-by-step explanation:

Given

$x\ \ \ \ \ \ \ \ \ \ y \\1\frac{2}{9}\ \ \ \ \ \ \ 2\frac{1}{3}$

Required

Determine the constant of proportionality (r)

Constant of proportionality (r) is calculated as

$y = rx$

When

$y = 2\frac{1}{3}$ $x = 1\frac{2}{9}$

Substitute these values in the given formula

$2\frac{1}{3} = r * 1\frac{2}{9}$

Convert both fractions to improper fractions

$\frac{7}{3} = r * \frac{11}{9}$

Multiply both sides by $\frac{9}{11}$

$\frac{7}{3} * \frac{9}{11}= r * \frac{11}{9} * \frac{9}{11}$

$\frac{7}{3} * \frac{9}{11}= r$

Reorder

$r = \frac{7}{3} * \frac{9}{11}$

$r = \frac{7 * 9}{3 * 11}$

Divide the numerator and denominator by 3

$r = \frac{7 * 3}{11}$

$r = \frac{21}{11}$

Convert to mixed fraction

$r = 1\frac{10}{11}$

Hence, the constant of proportionality is $1\frac{10}{11}$

4 0

3 years ago

Does someone mind helping me with this problem? Thank you!

Rasek [7]

Plug in x with -1

$8(-1)^{4} -3(-1)-7=?$
A negative number in parenthesis times an exponent is always positive.

8+3-7=4

4 0

3 years ago

11. ¿Es mayor 1/4 que 0.50? Justifica tu pregunta

musickatia [10]

Eh yo creo que no, si estoy mal los siento

3 0

3 years ago

-4 1/3 + 5 2/3 step by step

Dominik [7]

Answer:

1 1/3

Step-by-step explanation:

-4 1/3 + 5 2/3 = -13/3 + 17/3 { change into improper form}

= { (-13) + 17 } / 3

= 4 / 3

= 1 1/3

4 0

3 years ago

FI bisects angle GFH. Find GI.

Svetach [21]

Answer:

D: 13

Step-by-step explanation:

4k-7 = 2k+3

k=5

4(5)-7 = 13!

GI = 4k-7 which = 13

5 0

2 years ago