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3 years ago

What is the final sum of 3(4+9) = ?

Mathematics

2 answers:

Mandarinka [93]3 years ago

6 0

Answer:

39 is the answer

Step-by-step explanation:

12+27=39

otez555 [7]3 years ago

6 0

Answer: 39

Step-by-step explanation: You have to add what is in the parentheses first

(in this case, 4 and 9)

after you get the sum, you multiply it by whatever is outside of the parentheses

this gives you 13•3 which equals 39.

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The volume of a cylinder is 32.25 cubic inches. If a cone has the same height and radius as the cylinder what is its volume?

almond37 [142]

Cylinder volume is Pi*r^2*h
Cone is 1/3 the volume of a Cylinder.
32.25/3 = 10.75

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2 years ago

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-0.57 < -0.27k + 0.24 How do you do this one

marysya [2.9K]

3 < k

Step-by-step explanation:

Simplify by undoing addition to both sides, then divide both sides by the coefficient of k.

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3 years ago

The equation of the linear regression line represents the relationship between the number of cars washed for charity, x, and the

kondaur [170]

$520.
y=10x+20
Where x is the amount of cars.
y=10(50)+20
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3 years ago

A system of linear equations is shown below, where A and B are real numbers. 3x + 4y = A Bx – 6y = 15 What values could A and B

eduard

ANSWER

The equation has no solution if

$A=6$ and $B=-4.5$ .

EXPLANATION

The first equation is

$3x+4y=A--(1)$

and the second equation is

$Bx-6y=15--(2)$

We try solving this equation for B using the method of elimination.

We multiply equation (2) by 3 to obtain;

$3Bx-18y=45--(3)$

We also multiply equation (1) by B to obtain;

$3Bx+4By=AB---(4)$

We now subtract equation (3) from equation (4).

This will give us;

$4By+18y=AB-45$

We factor $y$ on the right hand side to get;

$(4B+18)y=AB-45$

We solve for y to obtain;

$y=\frac{AB-45}{4B+18}$

The above equation is defined for all real values except

$4B+18=0$

This implies that

$B=-\frac{18}{4}$

$B=-4.5$

Remember that the system will have no solution if and only if the denominator is zero and the numerator is not equal to zero.

This means that,

$AB-45\ne 0$

$\Rightarrow AB\ne 45$

When we substitute $B=-4.5$ , then we will have

$-4.5A\ne 45$

$\Rightarrow A\ne -\frac{45}{4.5}$

$\Rightarrow A\ne -10$

Hence the correct answer is option A

Note however that if both the numerator and denominator equal zero, then the system has infinitely many solutions.

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2 years ago

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Logan trades 50 pennies for nickels. He gets a nickel for each group of 5 pennies.

AlexFokin [52]

Answer: 50/5

Because 50 pennies and each nickel is 5 pennies

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3 years ago

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