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4 years ago

Evaluate the expression when c = -6 And y = 7 y - 9c

Mathematics

2 answers:

GrogVix [38]4 years ago

5 0

The answer is 61. hope that help.

telo118 [61]4 years ago

5 0

Write everything out: y - 9c becomes 7 - 9(-6) = 7 + 63 = 70.

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If A {2,4,6,8}, what is 2 € A?

hichkok12 [17]

Answer:

2 belongs to A

Step-by-step explanation:

€ symbol means "belongs to"

Therefore 2 € A

7 0

2 years ago

1. The department of nature resources reports that a fish is unsafe to eat if the polychlorinated biphenol (PCB) concentration e

Hitman42 [59]

Answer:

H0 rejected as μ>4

and a fish is unsafe to eat from the lake.

Step-by-step explanation:

1)Let the null hypothesis be H0 : mu ≤4 against the alternate Ha: mu > 4 ppb

H0: μ ≤4 against the claim Ha: μ>4

2) X`= ∑x/ n= 2.9 +7.6+ 4.8+ 5.2+ 5.1+ 4.7+ 6.9+ 4.9+ 3.7+ 3.8/10

= 49.6/10= 4.96

The standard deviation can be calculated sigma= 1.344767 ( using statistic calculator)

3) The significance level is taken to be ∝=0.05

The value of z at 0.05 for 1 sided test is z >± 1.645

i.e the critical region is less than - 1.645 and greater than +1.645

4) Taking the distribution to be approximately normal

Z= x`- u / s/ √n

Z= 4.96-4/ 1.345/10

Z= 4.96-4/ 1.345/3.1622

Z= 0.96/0.4253

Z= 2.257

5) Since the calculated value of z = 2.257 falls in the critical region we reject our null hypothesis and conclude that true mean value of the PCB concentration is greater than 4 (ppb) and that a fish is unsafe to eat from the lake.

3 0

3 years ago

What is the additive inverse of 16 5/7?

Vikki [24]

The additive inverse of a number is what u add to that number to get 0. The additive inverse of a = -a so the additive inverse of 16 5/7 = -16 5/7

3 0

3 years ago

Susan Bought a soccer ball for her brother. She wants to fool him by putting the ball into a box before wrapping it. The balls c

frutty [35]

Answer:

Ball cannot be fit inside the box.

Step-by-step explanation:

Given:

Circumference of ball = 26 inches

Dimension of box = 8.25 in x 8.25 in x 8.5 in.

We need to find the whether ball gets fits inside the box.

First we will find the Diameter of ball.

Circumference of ball is given so we will find radius of the ball.

Circumference of the sphere is equal to 2 times π times radius.

framing in equation form we get;

$2\pi \times r =26\\\\r= \frac{26}{2\pi}= 4.14\ in.$

Now we will find the Diameter of the ball.

Diameter of ball is equal to 2 times radius.

framing in equation form we get;

Diameter of ball = $2\times 4.14 = 8.28\ in$

Now given that two parallel sides of box has dimension which is 8.25 in.

Since Dimension of box is smaller than diameter of the ball.

Hence we can say that ball cannot be fit inside the box.

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3 years ago

For the princess’s wedding, the king put on a great wedding feast. He had 34 tables, each with 19 plates of ham. There were 73 t

iVinArrow [24]

Answer 5,352

Step-by-step explanation:

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3 years ago