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3 years ago

3x-2y=4 2x=y+2 Solve by the addition method or substitution method

Mathematics

1 answer:

cupoosta [38]3 years ago

8 0

I used the substitution method and got (0,-2)

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Williiam lost 25% of his marble,gave 1/6 of the remainder to his.Brother and had 120 marbles left.How many marbles did he have a

bija089 [108]

Answer:

Number of marbles with Williams at the starting = 192

Step-by-step explanation:

Let total number of marbles with Williams = m

He lost marbles = 25% of the total number

= $\frac{25}{100}\times m$

= $\frac{m}{4}$

Remaining marbles with Williams = m - $\frac{m}{4}$

= $\frac{3m}{4}$

He gave marbles to his brother = $\frac{1}{6}$ th of the remaining marbles

= $\frac{1}{6}\times \frac{3m}{4}$

= $\frac{m}{8}$

Remaining marbles after giving marbles to his brother = 120

Therefore, $\frac{3m}{4}-\frac{m}{8}=120$

$\frac{6m}{8}-\frac{m}{8}=120$

$\frac{5m}{8}=120$

m = $\frac{120\times 8}{5}$

m = 192

Number of marbles with Williams at the starting = 192

5 0

3 years ago

What is the value of -9 r - 7 when r = 2?

sashaice [31]

Answer:

I thinks its r = 11

Step-by-step explanation:

So you just need to take the number to the r and multipliy it by r So,

9x2=18

then minus it by the other number which would Be 7 so.

18-7=11

3 0

4 years ago

What is the sine value of pi? A. -1/2 B. 1/2 C. 0 D. 1

slega [8]

Answer: C) 0

You can use a calculator to get this answer, a reference table, or the unit circle. The angle pi radians is equivalent to 180 degrees. Note how the point on the unit circle corresponding to 180 degrees is (1,0). This point has a y coordinate of zero. More broadly, y = sin(theta) where theta is the angle.

8 0

3 years ago

Make r the subject p(r-s) = 2r PLEASE HELP ME GUYSSS

Makovka662 [10]

Answer:

p(r-s) = 2r

pr - ps = 2r

pr - 2r = ps

r(p-2) = ps

$r = \frac{ps}{p - 2}$

5 0

3 years ago

Read 2 more answers

At the electronics store, Martin earns a 4.5% commission on his monthly sales.If his sales for January were $1,350, how much of

Crank

Answer:

60.75

Step-by-step explanation:

Since he earns a 4.5% commission

you need to find 4.5% of $1,350

1350 x 0.045 = 60.75

8 0

4 years ago