All categories

3 years ago

Explain how to find 40×50 using mental math

Mathematics

2 answers:

Naya [18.7K]3 years ago

7 0

Multiply 4 * 5, which equals 20, and add the two zeroes(from 40 and 50) on the end.

That gives us:

2000

Reptile [31]3 years ago

6 0

Multiply 4 X5 which equals 20 then add two zeros because 40 has one zero and 50 has one zero hope that helps

You might be interested in

Factor completly 4x^2 +8x -5

DaniilM [7]

∑ Hey, jillianwagler ⊃

Answer:

$\left(2x-1\right)\left(2x+5\right)$

Step-by-step explanation:

║Given info║:

Factor completely: $4x^2 +8x -5$

Solution~:

Breaking the expression~: $\left(4x^2-2x\right)+\left(10x-5\right)$

Factor out 2x from 4x² -2x : 2x(2x-1)

Factor out 5 from 10x - 5 : 5(2x - 1)

Put together: $=2x\left(2x-1\right)+5\left(2x-1\right)$

Factor out 2x - 1: $=\left(2x-1\right)\left(2x+5\right)$

xcookiex12

8/19/2022

4 0

2 years ago

Please helpppp I'll give you brainliest

Delvig [45]

Step-by-step explanation:

$f(-1) = 7(-1) + 4 = -3$ (because -1 < 0)

$f(0) = 7(0) + 8 = 8$

$f(2) = 7(2) + 8 = 22$

4 0

3 years ago

Timed math quiz sucks

brilliants [131]

Answer:

Last option

Step-by-step explanation:

6 0

3 years ago

Read 2 more answers

Sixteen students each measured the weight of 25 pennies, in grams. The list shows their measurements. 60, 62, 65, 59, 63, 63, 63

saveliy_v [14]

Third one is the answer

5 0

3 years ago

Read 2 more answers

X2 - 8x + 15 = 0 quadratic formula

ivanzaharov [21]

The quadratic formula is x=(-b+-sqrt(b^2-4(a)(c)))/2a

Using the quadratic formula, we get:

x=(-(-8)+-sqrt((-8)^2-4(15)(1)))/2(1)

x=(8+-sqrt(64-60))/2

x=(8+-sqrt(4))/2

x=(8+-2)/2

x=10/2 and x=6/2

x=5 and x=3

We could do it way faster by completing the square:

x^2-8x+15=0

(x-5)(x-3)=0

x=5 and x=3

Hope both methods make sense! BTW, the +- thing means add or subtract

6 0

3 years ago