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3 years ago

Evaluate when x = 3, y = -3 and z = -2: xy + 2z A. 4 B. -13 C. -11 D. -5

Mathematics

1 answer:

MAVERICK [17]3 years ago

3 0

Answer:

B. -13

Step-by-step explanation:

X= 3

y= -3

z= 2

3(-3) +2(-2)

-9 -4

-9 + (-4)= -13

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Assuming that this is a complete, if scrambled, record of Ronald’s May spending and that any overdraft fees incurred do not affe

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The answer is C, Ronald overdrew his account twice

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4 years ago

Please help!!!!! pls pls pls

Sidana [21]

Answer:

It’s b

Step-by-step explanation:

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3 years ago

In 1997, the average household expenditure for energy was $1,338, according to data obtained from the U.S. Department of Energy.

makvit [3.9K]

Answer:

Null hypothesis H0: µ = $1,338

Alternative hypothesis Ha: µ ≠ $1,338

Which means;

Null hypothesis H0; the average household expenditure for energy is equal to $1,338

Alternative hypothesis Ha; the average household expenditure for energy is not equal to $1,338

Step-by-step explanation:

The null hypothesis (H0) tries to show that no significant variation exists between variables or that a single variable is no different than its mean. While an alternative Hypothesis (Ha) attempt to prove that a new theory is true rather than the old one. That a variable is significantly different from the mean.

Therefore, for the case above;

Null hypothesis H0: µ = $1,338

Alternative hypothesis Ha: µ ≠ $1,338

Which means;

Null hypothesis H0; the average household expenditure for energy is equal to $1,338

Alternative hypothesis Ha; the average household expenditure for energy is not equal to $1,338

6 0

3 years ago

I need help with this ASAP and can you explain so i can understand?!

Elanso [62]

Answer:

Adult tickets sold = 225

Student Tickets sold = 375

Step-by-step explanation:

Let:

Adult tickets sold = x

Student Tickets sold = y

Total tickets sold = 600

So, we can write: x+y = 600

Total money collected = 3037.50

Cost of 1 Adult ticket = $6.00

Cost of one Student ticket = $4.50

So, we can write: 6x+4.5y=3037.50

Now, we get a system of equations, that if solved we can find values of x and y

Let:

$x+y = 600--eq(1)\\6x+4.5y=3037.50--eq(2)$

We can solve using substitution method.

Finding value of x from eq(1) and putting it in eq(2)

$We\:have\\x+y=600\\x=600-y$

Put in eq(2)

$6x+4.5y=3037.50\\6(600-y)+4.5y=3037.50\\3600-6y+4.5y=3037.50\\-1.5y=3037.50-3600\\-1.5y=-562.5\\y=\frac{-562.5}{-1.5}\\y=375$

So, we get value of y = 375

Now put value of y in eq(1) to find value of x

$x+y=600\\Put\:y=375\\x+375=600\\x=600-375\\x=225$

So, we get value of x = 225

The Tickets sold will be:

Adult tickets sold = x = 225

Student Tickets sold = y = 375

3 0

3 years ago

Read 2 more answers

Is the expected wait time for 240 people less than, greater than, or equal to 40 minutes? How do you know?

Morgarella [4.7K]

Answer

Less than

Step-by-step explanation:

Because 40min is equal to 2400 seconds

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3 years ago