What percentage is 40 of 50 ?

Answers

Answer 1

Answer: 40/50?
1.convert the 50 to 100 'cause there are 100 percents in a percent(i just heard that from somebody)
2.50 * 2 = 100 so multiply 40 by 2
3.80,80% is your answer

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A polygon has 35 diagonals. How many sides does it have?

Answers

$d=35\n d=(n(n-3))/(2)\n d=(n(n-3))/(2)\n35=(n(n-3))/(2)\n 70=n^2-3n\n n^2-3n-70=0\n n^2-10n+7n-70=0\n n(n-10)+7(n-10)=0\n (n+7)(n-10)=0\n n=-7 \vee n=10\n\n n=10$

how do you work out the value of "d" in the equation: 7d=4d+21?

Answers

Subtract 4d from each side. / / / 3d = 21. / / / Divide each side by 3. / / / d = 7 .

I'm not completely positive but I believe this is how you do it.

7d=4d+21

7d - 4d = 21

3d = 21

3d / 3 = 21 / 3

d = 7

a store sells small notebooks for $7 and large notebooks for $14. if a student buys 6 note books for $63, how many notebooks each did she buy

Answers

The answer is 3 of each. 3X7=21; 14X3=42, and 42+21= 63.

She bought 3 large notebooks and 3 small notebooks, because 3 * 14 = 42 and 3 * 7 = 21 and 21 + 42 =63

Translate into an equation.
Five times the sum of twice a number, x, and six is thirty.

Find the number.

x =

Translate into an equation.

The difference between a number, x, and eleven is three.

Find the number.

x =

Solve and check.

4y - 3 = 12 + 3(y - 2)

y =

Solve and check.

10x - 2(4x - 7) = 28

x =

Answers

First one. 5 x 2x + 6 = 30
Second one. X-11=3

#1 5(2x+6)=30
x=0

#2 x-11=3
x=14

#3 y=9

#4

x=7

Whats the work for 0>3x-3-6

Answers

Hi Scotti

0>3x-3-6

0>3x-9

Now flip

3x-9<0

We need to add 9 to both sides

3x-9+9<0+9

3x<9

Divide both sides by 3 so we can find the value for x

3x/3<9/3

x<3

I hope that's help :)

Simplify and solve this equation: 4m + 9 + 5m – 12 = 42.A. m = -4
B. m = 4
C. m = –5
D. m = 5

Answers

4m + 9 + 5m – 12 = 42
Given the equation combine all similar terms found on a side of the equation.
You can add the "m" and get: 9m + 9 – 12 = 42
You can combine the 9 and the -12 and get: 9m - 3 = 42
Toget the "m" alone add or subtract any number necessary from the leftside so the number is 0, and do the same to the right: 9m - 3 + 3 = 42 +3, leaving you: 9m = 45
Divide each side by the number of "m" you have: (9m)/9 = 45/9 which simplifies to m=5.

The solution of expression 4m + 9 + 5m - 12 = 42 by combining like terms is,

⇒ m = 5

Given that,

A mathematical expression is,

⇒ 4m + 9 + 5m - 12 = 42

Now, simplify the expression by combining like terms and solve for m as,

⇒ 4m + 9 + 5m - 12 = 42

Combine like terms,

⇒ 9m - 3 = 42

Add 3 on both sides,

⇒ 9m = 42 + 3

⇒ 9m = 45