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3 years ago

800 decreased by 45%

Mathematics

2 answers:

Dmitry [639]3 years ago

8 0

Answer:

Equal to 440

Step-by-step explanation:

kvasek [131]3 years ago

3 0

Answer:

440

Step-by-step explanation:

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Simplify the expression(a4−6a2b2+ b4)−(−2a4+5a2b2+ 3b4) and hence, find its value for a = 2and b = −1.

ELEN [110]

Answer:

(a) $3a^4 - 11a^2b^2 -2b^4$

(b) $3a^4 - 11a^2b^2 -2b^4= 2$

Step-by-step explanation:

Given

$(a^4 - 6a^2b^2+ b^4) - (-2a^4+5a^2b^2+ 3b^4)$

Solving (a): Simplify

$(a^4 - 6a^2b^2+ b^4) - (-2a^4+5a^2b^2+ 3b^4)$

Open brackets

$a^4 - 6a^2b^2+ b^4 +2a^4-5a^2b^2- 3b^4$

Collect Like Terms

$a^4 +2a^4- 6a^2b^2-5a^2b^2+ b^4 - 3b^4$

Simplify Like Terms

$3a^4 - 11a^2b^2 -2b^4$

Solving (b): Simplify when a = 2 and b = -1

$3a^4 - 11a^2b^2 -2b^4$

$3*(2)^4 - 11*(2^2)*(-1)^2 -2*(-1)^4$

$3 * 16 - 11 * 4 * 1 - 2 * 1$

$48 - 44 - 2$

$= 2$

Hence:

$3a^4 - 11a^2b^2 -2b^4= 2$

4 0

2 years ago

What is the value of x in this figure?

dem82 [27]

The lengths of sides of a 30°-60°-90° triangle have the ratio 1 : √3 : 2. Multiplying these values by 5 tells you the sides have the lengths 5 : 5√3 : 10.

The length x of the middle-length side is ...
c. 5√3

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3 years ago

At the beach cleanup, Maya's group collected 14.8 pounds of trash on Saturday and 12.5 pounds on Sunday. Will's group collected

stellarik [79]

C) 15.5 pounds

Maya's group: 14.8 + 12.5 = 27.3

Will's group: 11.8 + ___ = 27.3
27.3 - 11.8 = 15.5

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3 years ago

The size of the rat population of a wharf area grows at a rate of 5% monthly. If there are

Evgesh-ka [11]

Answer:

200+10×12=320

Step-by-step explanation:

6 0

2 years ago

Moby middle school's bowling team has 3 bowlers. One member scored 157 and another scored 161. The average score must be at leas

Rudiy27

We must remember that average is simply the sum of all the scores divided by the number of scores. So:

165 = (157 + 161 + X) / 3

Calculating for the score of the third bowler X:

318 + X = 495

X = 177

Therefore the score of the third bowler must be 177 or greater. Hence:

5 0

3 years ago