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3 years ago

PLEASE HELP!!!!! The mass of a bar of chocolate is 1800g.

Mathematics

2 answers:

Serhud [2]3 years ago

6 0

Volume = mass divided by density

v = 1800g divided by 9g
= 200gcm3

vovikov84 [41]3 years ago

5 0

Answer:

Compare the overall density of the whole bar of chocolate to the density of 1/4 of the bar. Was the density significantly different (if the difference is less than 0.2 g/cm3, then we should assume that it’s the same)?

Step-by-step explanation:

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Can someone help me solve this ... please

lana66690 [7]

Answer:

t>28

Step-by-step explanation:

work is shown and pictured

4 0

4 years ago

19. The present age of brother and sister are in the ration 4:5 Before three years the ration of their age was 3:4. find their p

Lyrx [107]

Answer:

Sister = 15 years old

Brother = 12 years old

Step-by-step explanation:

Right now, if the brother is B years old and the sister is S years old, B = (4/5)S because the ratio from brother to sister is 4:5, so if one unit is X, B = 4X and S = 5X

Three years ago, the brother was B-3 years old and the sister was S-3 years old. Keeping one unit as X, we have

B = 3X

S = 4X

B-3 = (3/4)(S-3)

Therefore, we have a system of equations

B = (4/5)S

B-3 = (3/4)(S-3)

Substitute (4/5)S for B into the second equation to only have one variable

(4/5)S - 3 = (3/4)(S-3)

(4/5)S - 3 = (3/4)S - 9/4

add 3 to both sides and subtract (3/4)S from both sides to isolate the variable and its coefficient

(1/20)S = 3/4

multiply both sides by 20 to isolate the S

S = 15

B = (4/5)S = 12

5 0

3 years ago

Which of the following equations represents the perpendicular bisector of WX graphed below?

kotykmax [81]

The coordinates of the 2 given points are W(-5, 2), and X(5, -4).

First, we find the midpoint M using the midpoint formula:

$\displaystyle{ M_{WX}= (\frac{x_1+x_2}{2}, \frac{y_1+y_2}{2} )= (\frac{-5+5}{2}, \frac{2+(-4)}{2} )=(0, -1).$

Nex, we find the slope of the line containing M, perpendicular to WX. We know that if m and n are the slopes of 2 parallel lines, then mn=-1.

The slope of WX is $\displaystyle{ m= \frac{y_2-y_1}{x_2-x_1}= \frac{2-(-4)}{-5-5}= \frac{6}{-10}= -\frac{3}{5}$ .

Thus, the slope n of the perpendicular line is $\displaystyle{ \frac{5}{3}$ .

The equation of the line with slope $\displaystyle{ n= \frac{5}{3}$ containing the point M(0, -1) is given by:

$\displaystyle{ y-(-1)=\frac{5}{3}(x-0)$

$\displaystyle{ y+1= \frac{5}{3}x$

$\displaystyle{ 3y+3=5x$

$\displaystyle{ 5x-3y-3=0$

Answer: 5x-3y-3=0

8 0

4 years ago

5. Chelsea is mixing her favorite hue of purple paint. Her mixture requires 5 ounces of red and 8 ounces of

Schach [20]

Step-by-step explanation:

Write a proportion.

5 / 8 = 6 / x

Cross multiply.

5x = 48

Divide.

x = 9.6

She will need 9.6 ounces of blue paint.

8 0

3 years ago

A triangle has two sides of lengths 5 and 12 what value could be the third side check all that apply

seropon [69]

Answer:

9 and 11

Step-by-step explanation:

6 0

3 years ago