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2 years ago

Heather has to solve this system of equations using elimination. What should be her first step?

2 answers:

8 0

The elimination method is used for solving linear systems of equations.It is way of solving a linear system of equations.In the elimination method we either add or subtract the equations to get an equation in one variable.The main concept behind elimination method is to create terms with opposite coefficients because they cancel each other when added.

When the coefficients of one variable are opposites you add the equations to eliminate a variable and when the coefficients of one variable are equal you subtract the equations to eliminate a variable.

When Heather has to solve this system of equations using elimination her first step will be to make the coefficients of x or y the same so that one of the variable is eliminated on addition or subtraction of the equations.

charle [14.2K]2 years ago

6 0

I don’t know what the equation is but when using elimination you should cancel out opposite numbers such as 4x and negative 4x

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You work for a pharmacy and monthly sales of asthma inhalers in your pharmacy follows a normal distribution with a mean of 191 i

grin007 [14]

Answer: -1.33 .

Step-by-step explanation:

Formula to find the Z-score :

$Z=\dfrac{\text{Expected value - Mean}}{\text{Standard deviation}}$

Given: Mean = 191 and Standard deviation = 21

Then , the z-score corresponding to the expected value of 163 will be :

$Z=\dfrac{163-191}{21}\\\\=\dfrac{-28}{21}\approx-1.33$

Hence, the z score corresponding to selling 163 inhalers is -1.33 .

3 0

2 years ago

Find the volume of this cylinder. Please help

algol13

Answer:

$\boxed {\boxed {\sf 384 \ ft^3}}$

Step-by-step explanation:

The volume is the space an object occupies. The volume formula for a cylinder is provided and it is:

$V= \pi r^2 h$

Where:

r= radius
h= height

The radius is the distance from the center of the circle to the edge, and it is 4 feet. The height is 8 feet. We are told to use 3 for pi.

r= 4 ft
h= 8 ft
π= 3

Substitute the values into the formula.

$V= (3)(4 \ ft)^2 (8 \ ft)$

Solve the exponent.

(4 ft)²= 4 ft * 4 ft = 16 ft²

$V= (3)(16 \ ft^2)(8 \ ft)$

Multiply the three numbers together.

$V= 48 \ ft^2 (8 \ ft)$

$V= 384 \ ft^3$

The volume of the cylinder is approximately <u>384 cubic feet.</u>

8 0

2 years ago

Doris takes a survey of her class and finds that 2 of the 20 students in class are left-handed.

djyliett [7]

Hey there, Alex!

She would expect 55 of them to be left handed.

Work: 550 / 20 = 27.5

27.5 x 2 = 55

Hope I was able to help!

6 0

3 years ago

What is 7- 3 2/5 thanks

konstantin123 [22]

The answer is 3.6 or 3 6/10 or 3 3/5 all equivalent

5 0

2 years ago

Read 2 more answers

If two are supplementary and one of the angles measure 62 what is the measure of the other angle

Juli2301 [7.4K]

Supplementary angles add to equal 180 degrees. If two angles are supplements of each other and one of the angles measures 62 degrees, you can set its sum with the unknown angle, x, equal to 180 and solve for the unknown angle x.

Equation:
180 = x + 62

Subtract 62 from both sides:
118 = x

Answer:
The measure of the other angle is 118°.

8 0

2 years ago