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3 years ago

Y= negative 2X -7 how do I solve this equation algebraically

Mathematics

1 answer:

ratelena [41]3 years ago

5 0

You cannot solve this equation, because you have no y or x values. However, you can change the equation to equal x.

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The volume of a right circular cone is 2,279.64 in cubed. If the height of the cone is 18 in, what is the diameter of the cone?

Aleksandr [31]

ANSWER

A. 22 in

EXPLANATION

The volume of a cone is calculated using the formula:

$Volume = \frac{1}{3} \times \pi {r}^{2} h$

It was given that: the volume is 2,279.64 in³

The height of the cylinder is also given as: h=18 in.

We substitute, the given values into the formula to get:

$2279.64= \frac{1}{3} \times (3.14) \times {r}^{2} \times 18$

$2279.64= 18.84 {r}^{2}$

${r}^{2} = \frac{2279.64}{18.84}$

${r}^{2} = 121$

We take positive square root to get;

$r = \sqrt{121}$

$r = 11in$

Therefore the diameter is 2(11) which is equal to 22 inches.

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3 years ago

Plz help me get the right answer ASAP please

Ierofanga [76]

<h2>Greetings!</h2><h3>When expanding brackets, you simply multiply whatever is inside the brackets by what is outside:</h3>

$(7x * x) + (7x * 20)$

<h3>Which would result in the answer being:</h3>

$7x^{2} + 140x$

<h2>Hope this helps!</h2>

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3 years ago

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A French class has a total of 31 students. The number of males is 7 more than the number of females. How many males and how many

Inessa05 [86]

Answer:

Step-by-step explanation:

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3 years ago

Math help questions <br>

Evgen [1.6K]

After 1 year, the initial investment increases by 7%, i.e. multiplied by 1.07. So after 1 year the investment has a value of $800 × 1.07 = $856.

After another year, that amount increases again by 7% to $856 × 1.07 = $915.92.

And so on. After t years, the investment would have a value of $\$800 \times 1.07^t$ .

We want the find the number of years n such that

$\$856 \times 1.07^n = \$1400$

Solve for n :

$856 \times 1.07 ^n = 1400$

$1.07^n = \dfrac74$

$\log_{1.07}\left(1.07^n\right) = \log_{1.07}\left(\dfrac74\right)$

$n \log_{1.07}(1.07) = \log_{1.07} \left(\dfrac74\right)$

$n = \log_{1.07} \left(\dfrac74\right) = \dfrac{\ln\left(\frac74\right)}{\ln(1.04)} \approx \boxed{8.3}$

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2 years ago

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Which relation is a function?

Annette [7]

Answer:

B is the answer because a function is if none of the x values are the same with different y values.

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2 years ago