PLZ ANSWER I WILL GIVE 100 POINTS

Mathematics

2 answers:

andrew-mc [135]3 years ago

6 0

Answer:

A yes

B yes

C no

D no

Step-by-step explanation:

Convert the mixed numbers to improper fractions, then find the LCD and combine.

Exact Form:

45/4

Decimal Form:

11.25

Mixed Number Form:

11 1/4

there you go told you i can edit

Inessa05 [86]3 years ago

6 0

Answer:

a. yes b. no c. yes d. yes

Step-by-step explanation:

You might be interested in

Leo has $10 more than Sofia and Jacob has $5 less than Sophia. Together, the three siblings have a total of $ 98. How much money

Mariulka [41]

Answer:

Sophia has 31

Leo has 41

Jacob 26

Step-by-step explanation:

5 0

4 years ago

-3x-8y=20 -5x+y=19 substitute

andreyandreev [35.5K]

$-3x-8y=20\\ \\ -5x+y=19$

First let's multiply the first equation by -5 and the second one by 3

$-5\cdot (-3x-8y)=-5\cdot 20\\ \\ 15x+40y=-100$

$3\cdot (-5x+y)=3\cdot 19\\ \\ -15x+3y=57\\$

And now let's add these two new equations.

$15x+40y=-100\\ \\ -15x+3y=57\\ \\ (15x+40y)+(-15x+3y)=-100+57\\ \\ 15x-15x+40y+3y=-43\\ \\ 43y=-43\\ \\ y=\quad \frac { 43 }{ -43 } \\ \\ y=\quad -1$

We found y's value. Let's put it in one of the equations to find x.

$y=\quad -1\\ \\ -3x-8y=20\\ \\ -3x-8\cdot -1=20\\ \\ -3x+8=20\\ \\ -3x=20-8\\ \\ -3x=12\\ \\ x=\quad \frac { 12 }{ -3 } \\ \\ x=-4$

Solution : (-4, -1)

Good Luck !

4 0

3 years ago

18 A woman is 3 times as old as her son.

photoshop1234 [79]

Answer:

The son in 12 years old and the woman is 36 years old

Step-by-step explanation:

Let the woman’s current age be w years and son’s age be s years. According to the question, the woman is 3 times as old as her son then, w=3s Also, it is given that 8 years ago the product of their ages were 112 Therefore, (w-8)(s-8)=112 (3s-8)(s-8)=112 Solving for s, we get $3 s^{2}-32s-48=0$ By using quadratic equation $s=\frac{-b \pm \sqrt{b^{2}-4 a c}}{2 a}=\frac{-(-32)+\sqrt{32^{2}-4(3)(-48)}}{2(3)}=\frac{-(-32)+\sqrt{1570}}{6}=\frac{71,62}{6}=11.9 \cong 12$ s=12 We know that w=3s w= $3 \times 12$ = 36. Hence, the woman’s age is 36 years and the son’s age is 12 years.