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3 years ago

The product of four less than a number and nine is fifteen *Need help on this please

Mathematics

1 answer:

densk [106]3 years ago

7 0

Answer:

The easiest way is to determine what number times 9 equals 15.

9x = 15

x = 15 / 9 = 5/3

The original number is 4 + 5/3 = 5 (2/3)

Then we look at the problem again,

5 and (2/3) minus 4 = 5/3 and

5/3 * 9 = 45/3 = 9

Step-by-step explanation:

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N + 1 - 3N = 9 - N (IN A TEST)

rjkz [21]

Answer:

N= -8

Step-by-step explanation:

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2 years ago

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garri49 [273]

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3 years ago

I only need to know question b, if anyone can help

kicyunya [14]

243 liters represents 7/10 - 1/4 of the water.

v=243 / (7/10 - 1/4) = 243 / (14/20-5/20) = 243(20)/9 = 540 liters.

Answer: 540 liters

Check:

(7/10)(540) = 7(54) = 378

(1/4)540 = 135

difference = 378 - 135 = 243 good

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3 years ago

Consider the graph at right showing an economy in recession. Aggregate demand is currently at AD0. Equilibrium currently occurs

scoray [572]

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3 0

2 years ago

A college football coach has decided to recruit only the heaviest 15% of high school football players. He knows that high school

Alla [95]

Answer:

The coach should start recruiting players with weight 269.55 pounds or more.

Step-by-step explanation:

We are given the following information in the question:

Mean, μ = 225 pounds

Standard Deviation, σ = 43 pounds

We are given that the distribution of weights is a bell shaped distribution that is a normal distribution.

Formula:

$z_{score} = \displaystyle\frac{x-\mu}{\sigma}$

We have to find the value of x such that the probability is 0.15

$P( X > x) = P( z > \displaystyle\frac{x - 225}{43})=0.15$

$= 1 -P( z \leq \displaystyle\frac{x - 225}{43})=0.15$

$=P( z \leq \displaystyle\frac{x - 225}{43})=0.85$

Calculation the value from standard normal z table, we have,

$P(z < 1.036) = 0.85$

$\displaystyle\frac{x - 225}{43} = 1.036\\\\x = 269.548 \approx 269.55$

Thus, the coach should start recruiting players with weight 269.55 pounds or more.

3 0

3 years ago