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3 years ago

A point

Mathematics

1 answer:

Yuki888 [10]3 years ago

6 0

Answer:

i think it A someone correct me

Step-by-step explanation:

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2r2 + 3s3 − r2 + 4t2 − r2 if r = −2, s = −3, and t = 5.

Elza [17]

First, simplify the expression $2r^2 + 3s^3 - r^2 + 4t^2 - r^2.$ Here you have three terms with $r^2,$ group them in the following way:

$2r^2 + 3s^3 - r^2 + 4t^2 - r^2=2r^2-r^2-r^2+3s^3+4t^2=(2r^2-r^2-r^2)+3s^3+4t^2=$

$=r^2(2-1-1)+3s^3+4t^2=3s^3+4t^2.$

Then substitute s=-3 and t=5:

$3s^3+4t^2=3\cdot (-3)^3+4\cdot 5^2=3\cdot (-27)+4\cdot 25=-81+100=19.$

Answer: 19.

3 0

3 years ago

Read 2 more answers

How many soultions does 5(x-3)+6=5x-9

olya-2409 [2.1K]

5(x - 3) + 6 = 5x - 9 has no solution

<em><u>Solution:</u></em>

We have to find the number of solutions for the given equation

Given equation is:

5(x - 3) + 6 = 5x - 9

Multiply the terms inside with bracket with constant outside the bracket

5x - 15 + 6 = 5x - 9

Add the constants in left hand side of equation

5x - 9 = 5x - 9

If the coefficients are the same on both sides, then the sides will not equal, therefore no solutions will occur.

Here, 5x - 9 = 5x - 9

The coefficients are same in both sides of equation

Therefore, the equation has no solution

5 0

3 years ago

Write an expression that I’d equivalent to 1/2a - 4. URGENT, LIMITED TIME.

SCORPION-xisa [38]

Answer:

1/2(a-4)

Step-by-step explanation:

first blank is 1/2 and second is 4.

7 0

2 years ago

Miracle sells 28 dozens of donuts on Wednesday. Each dozen cost $18. How much is one

Nutka1998 [239]

Answer:

$1.5

Step-by-step explanation:

if each dozen cost $18, we need to divide.......18/12........because 12 is a dozen.

18/12 = 1.5

4 0

3 years ago

A salesman makes 5% commission on sales. what is his commission on $4,321 worth of sales? 216.05 2,160.50 8,642.00 86,420.00

Free_Kalibri [48]

216.05 is the answer because you have to divide $4,321 by 100, and multiply that by 5.

6 0

3 years ago