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3 years ago

7

20% of all the children in a class are left handed. 4 children are left handed. How many children are there in the class all tog

ether?

1 answer:

Katarina [22]3 years ago

7 0

There are 20 students all together.

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42 decreased by the product of 12 and a number is 6.

levacccp [35]

42 - 12x = 6
Solve for 6

12x = 36

x = 3

4 0

3 years ago

A. 3.9<br><br> B. 1.0<br><br> C. 1.7<br><br> D 3.3

amm1812

Answer:

its for sure C

Step-by-step explanation:

4 0

3 years ago

And an electronics warehouse ships TVs and DVD players to retailers all throughout the United States. The weight of three televi

vodomira [7]

X= weight of TV
y= weight of CD

3x+5y= 62.5
3x+ 2y= 52
You can either solve for a variable, or eliminate a variable by subtracting the second equation from the first:

3x + 5y = 62.5
-(3x+2y = 52)
0 + 3y = 10.5, so y = 10.5/3 or 3.5.

Now plug y= 3.5 back into any equation to get x:

3x + 5(3.5) = 62.5
3x + 17.5 = 62.5
3x = 45
x = 15
Always check work. Both equations should be true for x=15, y= 3.5

4 0

3 years ago

The Senior class held an election for class president. Pamela received three (3) votes for every two (2) votes Angela received.

likoan [24]

Answer:

46

Step-by-step explanation:

Divide 69 by 3

69 / 3 = 23

Take it times two.

23 x 2 = 46

Proportion

$\frac{3}{2} =\frac{69}{x}$

Cross multiply and solve for x.

6 0

3 years ago

Find the area of an equilateral triangle that has perimeter of 24 m.

mafiozo [28]

we know the perimeter is 24, and is an equilateral triangle, so it has three equal sides, so each side is 24 ÷ 3 = 8.

$\bf \textit{area of an equilateral triangle}\\\\ A=\cfrac{s^2\sqrt{3}}{4}~~ \begin{cases} s=side's\\ \qquad length\\ \cline{1-1} s = 8 \end{cases}\implies A=\cfrac{8^2\sqrt{3}}{4}\\\\\\ A=16\sqrt{3}\implies A\approx 24.71$

6 0

3 years ago