4 years ago

Prove: If a^2-a is even then a is even.

Mathematics

1 answer:

Alla [95]4 years ago

6 0

This is not always true. Consider $a=3$ . Then $3^2-3=9-3=6$ is even, but $a$ is odd.

You might be interested in

Work out 252% of 120.

Alenkinab [10]

Answer:

302.4

Step-by-step explanation:

252% × 120 =

(252 ÷ 100) × 120 =

(252 × 120) ÷ 100 =

30,240 ÷ 100 =

302.4

8 0

3 years ago

Read 2 more answers

It would be really nice if you guys could help me out with this

faust18 [17]

Answer:

times 2

Step-by-step explanation:

2×2=4

-7×2=-14

which is why the scale factor is times 2

7 0

3 years ago

If f(x) = 2x - 5, then f(4) is<br> 17<br> 5<br> 4<br> 3

vagabundo [1.1K]

Answer:

Step-by-step explanation:

The notation "f(4)" means you put 4 where x is in the algebraic expression, then do the arithmetic.

f(4) = 2·4 -5

= 8 -5

= 3

6 0

4 years ago

Read 2 more answers

SMART STUDENT PLEASE NEED GOOD MATH STUDENT

tangare [24]

Answer:

Therefore 'x' is equal to 65.4°

Step-by-step explanation:

In Right Angle Triangle ABC

∠ B = 90°

AC = Hypotenuse = 12

CB = Adjacent Side = 5

To Find:

∠ C = x

Solution:

In Right Angle Triangle ABC Cosine Identity we have

$\cos C = \frac{\textrm{side adjacent to angle C}}{Hypotenuse}\\$

Substituting the values we get

$\cos C = \dfrac{CB}{AC}=\dfrac{5}{12}$

$\angle C = \cos^{-1}(0.4166)=65.37=65.4\°$

Therefore 'x' is equal to 65.4°

8 0

3 years ago

Each glass vase at a Mother’s Day brunch has 8 stems, of which 37.5% are stems of greenery. How many stems of greenery are in ea

ella [17]

I believe the answer is there are 3 stems of greenery in each vase.

You just do 8 times 37.5% or 0.375 and get 3.

6 0

3 years ago