The sign of the product of –35 and –625 is . The sign of the product of 263 and 0 is . The sign of the product of –21 and 451 is . The sign of the product of –350 and 89 is .

+ 21, 875;

0;

-9,471;

-31, 150

Step-by-step explanation:

Product means multiplication, and the signs has a rule: negative (- ) x negative (- )= positive (+)

Positive (+) x positive (+) = positive (+)

Negative (-) x positive (+) = negative (-)

Positive (+) x negative (-) = negative (-)

From the above sign rules,

Therefore, the sign of the product of –35 and –625 is +21, 875

The sign of the product of 263 and 0 is 0 .

Any number multiplied by 0 is 0

The sign of the product of –21 and 451 is -9,471

The sign of the product of –350 and 89 is -31,150 .

I hope this is clear, I am available for further questions on this, meanwhile, please mark as brainliest answer.

56.6

step-by-step explanation:

the ratio of the perimeters is equal to the scale.

the ratio of the areas is equal to the square of the scale.

34 / 20 = k

a / 19.6 = k²

substituting:

a / 19.6 = (34 / 20)²

a = 19.6 (34 / 20)²

a ≈ 56.6