All categories

3 years ago

Explain how to use mental math to add 37+33

Mathematics

2 answers:

yaroslaw [1]3 years ago

4 0

The answer would be 70 and mental math is to break it down to smaller easier pieces

drek231 [11]3 years ago

3 0

Add 3 to 37 to get 40 and then subtract 3 from 33 to get 30. add 40 and 30 so you get 70 and you don't have to worry about adding or subtracting the other 3's you added & took away since they canceled each other out!

You might be interested in

The product of g and 4 is 88 x= ?

Evgesh-ka [11]

Answer:

x = 22

Step-by-step explanation:

22 x 4 = 88

4 0

3 years ago

Help please!

Mamont248 [21]

Answer: see proof below

Step-by-step explanation:

Use the Sum & Difference Identity: cos (A + B) = cos A · cos B - sin A · sin B

Recall the following from Unit Circle: cos (π/2) = 0, sin (π/2) = 1

cos (π) = -1, sin (π) = 0

Use the Quotient Identity: $\tan A=\dfrac{\sin A}{\cos A}$

Proof LHS → RHS:

$\text{LHS:}\qquad \qquad \dfrac{\cos \bigg(\dfrac{\pi}{2}+x\bigg)}{\cos \bigg(\pi +x\bigg)}$

$\text{Sum Difference:}\qquad \dfrac{\cos \dfrac{\pi}{2}\cdot \cos x-\sin \dfrac{\pi}{2}\cdot \sin x}{\cos \pi \cdot \cos x-\sin \pi \cdot \sin x}$

$\text{Unit Circle:}\qquad \qquad \dfrac{0\cdot \cos x-1\cdot \sin x}{-1\cdot \cos x-0\cdot \sin x}$

$=\dfrac{-\sin x}{-\cos x}$

Quotient: tan x

LHS = RHS $\checkmark$

7 0

3 years ago

Read 2 more answers

Need help solving this -3 + y = 0

Mrrafil [7]

Fue answer is poseitive3

8 0

3 years ago

Read 2 more answers

Find the number the comes next 1.2.6,21.88,?

Nataly_w [17]

Answer

455

Step-by-step explanation:

(1×1) + 1 = 2

(2×2) + 2 = 6

(6×3) + 3 = 21

(21×4)+4 = 88

(88×5)+5 = 445

5 0

2 years ago

Read 2 more answers

The price of a sweater was reduced from $20 to $12 by what percentage was the price of the sweater reduced

CaHeK987 [17]

It should be a 40% reduction :)

5 0

3 years ago