3 years ago

82+42 using mental math with associative property

1 answer:

5 0

82
+42
------
124
--------------------------------------------------------------------------------------------------------
You're welcome! Hope this helped!

You might be interested in

A 4m ladder rest against a vertical wall with its foot 2m from the wall.How far up the wall does the ladder reach?

adell [148]

A) How high up the wall does it reach?

Use the Pythagorean theorem

Height^2 + Base^2 = Hyp^2

H^2+ 2^2 = 4^2 Subtract the 2^2 from both sides

H^2 = 4^2 -2^2 Multiply the square roots of both the numbers

H^2= 16 - 4

H^2 = 12

H= sqrt(12) m

Hope this helps

4 0

3 years ago

Jack's average in math for the first nine week was an 88. His second nine weeks average decreased 12.5 . What was his average fo

pashok25 [27]

The answer is that his average is 75.5 for the second nine weeks

5 0

3 years ago

Mariah worked for 3 hours and earned a total of $28.50 Which equation can be used to find r the amount of money Mariah earns an

bixtya [17]

Mariah earn 9.5 an hour

3 0

2 years ago

What is the sum of 2 numbers is 30 and their difference is 6 answer?

gayaneshka [121]

The numbers are 18 and 12

7 0

3 years ago

Express secΦ in terms of tanΦ

Sunny_sXe [5.5K]

Answer:

$\sec\theta=\sqrt{1+\tan^2\theta}$

Step-by-step explanation:

The trigonometric identity is :

$\sec^2\theta-\tan^2\theta=1\\\\or\\\\\sec^2\theta=1+\tan^2\theta$

We need to express secθ in terms of tanθ.

The above equation becomes,

$\sec\theta=\sqrt{1+\tan^2\theta}$

Hence, this is the required solution.

5 0

3 years ago