What is the value of the equation below when a=3 and b=7
a2-2b

Answers

Answer 1

Answer: This equation uses substitution
a=3 b=7
a2-2b
(3)2-2(7)
5-14
-9

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Helen bought 4 gallons of paint to redecorate her family room. If she uses 4/5 of the paint on the family room walls how much paint does Helen have left over ?

Answers

she has 3.2 gallons of paint left

Write an inequality for
A farmer weighs a dozen chicken eggs. The heaviest egg is 56g.

Answers

The inequality that represents the maximum weight of the dozen eggs of the farmer is; w ≤ 672

How to write inequalities?

We are told that a farmer weighs a dozen chicken eggs.

Now, we see that the heaviest of the weighed dozen chicken eggs is gotten to be 56 g.

Thus, if the heaviest is 56 g, then the maximum weight of all the 12 eggs in a dozen is;

Maximum weight of eggs = 56 * 12

Maximum weight of eggs = 672

Thus, the required inequality is;

w ≤ 672

where w is weight of all 12 eggs.

Read more about Inequalities at; brainly.com/question/25275758

Answer:672

Step-by-step explanation:just multiply a dozen by 56

You are traveling in a car at 60 miles per hour and are 400 miles away from your destination. Equation y = 400 - 60x is used to represent the distance from your destination after x hours. Identify the slope and the y intercept and explain what they mean.

Answers

Answer: slope = -60 , y - intercept = 400

Step-by-step explanation:

Given :

y = 400 - 60x

comparing with the equation of the line in slope - intercept form

y = mx + c , where m is the slope and c is the y - intercept

then ;

slope = -60

y - intercept = 400

(ii) The interpretation of the slope and the intercept.

Recall that speed = distance / time , that is

distance = speed x time.

it was given that the car is travelling 60 miles per hour , and the equation is used to model the distance from destination after x hours.

And you are 400 miles away from your destinations, this means that after x hours , you have traveled 60x miles , to know how far you are to your destination , the distance covered after x hours will be subtracted from how far you are away from your destination , that is

400 - 60 x.

The means that the y in the equation represent how far you will be to your destination after x hours.

The elevation of your plot of land is 2 feet below sea level. You add 7 feet of dirt to your land. What is the new elevation of your land?

Answers

Answer: 5

Step-by-step explanation: -2+7=5

when the signs are different you subtract and when the signs are the same you add. Then you keep the sign of the bigger number.

The answer would be nine because you start at 2 and add 7

How do I solve this equation

Answers

-x - y = 8
2x - y = -1

Ok, we are going to solve this in 2 parts. First we have to solve for one of the variables in one of the equation in terms of the other variable. I like to take the easiest equation first and try to avoid fractions, so let's use the first equation and solve for x.

-x - y = 8 add y to each side
-x = 8 + y divide by -1
x = -8 - y

So now we have a value for x in terms of y that we can use to substitute into the other equation. In the other equation we are going to put -8 - y in place of the x.

2x - y = -1
2(-8 - y) - y = -1 multiply the 2 through the parentheses
-16 - 2y - y = -1 combine like terms
-16 - 3y = -1 add 16 to both sides
-3y = 15 divide each side by -3
y = -5

Now we have a value for y. We need to plug it into either of the original equations then solve for x. I usually choose the most simple equation.

-x - y = 8
-x - (-5) = 8 multiply -1 through the parentheses
-x + 5 = 8 subtract 5 from each side
-x = 3 divide each side by -1
x = -3

So our solution set is

(-3, -5)

That is the point on the grid where the 2 equations are equal, so that is the place where they intersect.

Simplify -2[9 - (x + 7)]

Answers

Hey there! $-2[9 - (x + 7)] \n \n \n( -2(9) + -2(-x) + -7) \n \n -2(9) +-2(-x) + -2 (-7) \n \n \n -2(9) = -18 \n-2(-x) = 2x \n -2(-7) = 14 \n \n \n -18 + 2x + 14 \n \n \n \n Combine \n like\n terms: -18 , 14 \n \n \n -18 +14 = -4 \n \n \n \n Answer: 2x - 4 \n \n \n \n \n \n Good\n luck \n on \n your \n assignment \n and \n enjoy \n your \n day!$

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