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Lunna [17]
2 years ago
14

State whether each equation is true or false 2(4+5)=13

Mathematics
2 answers:
Mandarinka [93]2 years ago
5 0
2(4+5)
2(9)
18

18 does not equal 13.
Final answer: False

Remember to solve by working within parentheses first according to the order of operations.
Sergeeva-Olga [200]2 years ago
4 0
False 2(4+5)=13 equal 18
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The sum of three consecutive odd numbers is one hundred twenty -three what is the smallest number of three numbers ?
Vinil7 [7]

Answer:

117 118 119

Step-by-step explanation:

8 0
3 years ago
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Solve for . need 20 letters lol<br> /5 = −9
Fantom [35]

Answer:

r=-45

Step-by-step explanation:

r/5=-9

x 5    x5

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r=-45

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3 0
3 years ago
What is 2/9 divide 9/10=
Ipatiy [6.2K]

To divide fractions:

Flip the second fraction

Multiply the numerators

Multiply the denominators

Simplify


2/9*10/9

2*10=20

9*9=81

20/81


Hope this helps!!

6 0
2 years ago
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A ship travels 62.5 km in 1st hour of sailing. Starting from 2nd hour, the distance travelled per hour is x% of that in the prec
Bas_tet [7]
Speed of the ship in the second hour =  (62.5 * x ) / 100  kph.

In third hour it is  [(62 * x) / 100 ] * x/100]

is 4th hour its is the above * x/100 again  so we can now form the equation

62.5x      x          x
------- *   ----  *  ----    =  32
100      100      100

62,5 x^3 = 32,000,000
x^3 =  512,000
x = 80 <-----  Answer  to (a)

(b)  Ship travels 62.5 in first hour then  this falls by a common ratio of 0.8 each hour so we have a geometric sequence 

Dist travelled in 6 hours  =  a1  1 - r^n
                                                --------  = 62.5* (1 - 0.8^6) / 1 -0.8 = 230.56

                                               1 - r

Answer is    230.56 km 




5 0
3 years ago
Choose the expression that represents a cubic expression.
Anna007 [38]

Answer:

10x³ - 6x² - 9x + 12 is a cubic expression ⇒ 2nd

6x + 6 is a linear expression ⇒ 1st

5x² + 9x - 1 is a quadratic expression ⇒ 2nd

Quadratic expression ⇒ 1st

Step-by-step explanation:

* Lets explain the degree of any expression

- The degree of any expression is the greatest power of the variable

- Ex:

# 3x - 3 is a first degree expression

# x² - 3x + 2  is a second degree expression

# 5x³ - 2x² + 5x - 2 is a third degree expression

- The first degree expression is called linear expression

- The second degree expression is called quadratic expression

- The third degree expression is called cubic expression

* Lets solve the problem

∵ The cubic expression is the expression with greatest power of 3

∴ 10x³ - 6x² - 9x + 12 is the cubic expression

∵ The linear expression is the expression with greatest power of 1

∴ 6x + 6 is a linear expression

∵ The quadratic expression is the expression with greatest power of 2

∴ 5x² + 9x - 1 is a quadratic expression

∵ The expression is -2x² + 11

∵ The greatest power of x is 2

∴ -2x² + 11 is a quadratic expression

3 0
3 years ago
Read 2 more answers
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