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3 years ago

Find the value of y y=5a-3b +c, if a=4 and c=8

Mathematics

2 answers:

Svetach [21]3 years ago

8 0

I hope this helps you

nordsb [41]3 years ago

3 0

Y=5(4)-3(b)+8
y=20-3b+8
y=28-3b
dunno what b is

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1. Evaluate -3x^3 -2y^2 when x=-5 and y =3

-Dominant- [34]

Answer:

357

Step-by-step explanation:

A) We replace x = - 5 and u = 3 into -3x^3 -2y^2

and we have -3x^3 -2y^2= -3*(-5)^3 -2*3^2= -3*(-125)- 2*9

or -3x^3 -2y^2 = 375-18= 357

The answer is 357.

B) Replace h = -2 into h^2-3h+2

we have h^2-3h+2 = (-2)^2 -3*(-2) +2 = 4 +6 + 2= 12

The answer is 12

Have a good day.

8 0

4 years ago

The sum of two numbers is 70.one number is ten more than twice the number. Find the number

My name is Ann [436]

Answer:

Step-by-step explanation:

4 0

4 years ago

If anyone knows what this is can u explain your answer

777dan777 [17]

In a circle, the measure of an inscribed angle is half the measure of the intercepted arc.

m∠B = arc AC/2 = 110/2 = 55°

5 0

3 years ago

A shirt cost $18.99 with a 6.5% sales tax. What is the final cost?

velikii [3]

Answer:

$20.22

Step-by-step explanation:

You multiply 18.99 with 0.065 to see how much extra money you have to pay. Then you add it back to 18.99 for the final cost.

3 0

3 years ago

Determine if the matrix below is invertible. Use as few calculations as possible. Justify your answer.

Marysya12 [62]

Answer:

This shows 3 pivot position matrixes.

Step-by-step explanation:

The given matrix is:

$\left[\begin{array}{ccc}1&-2&-5\\0&4&3\\-3&3&0\end{array}\right]$

The option D is correct for this matrix.

The matrix is invertible and the given matrix has 3 pivot positions.

The matrix is invertible if its determinant is nonzero.

Multiply the 3rd row by 1/3.we get:

$\left[\begin{array}{ccc}1&-2&-5\\0&4&3\\-1&1&0\end{array}\right]$

Now, add the first row with third row:

$\left[\begin{array}{ccc}0&-1&-5\\0&4&3\\-1&1&0\end{array}\right]$

Replace third row by first row:

$\left[\begin{array}{ccc}-1&1&0\\0&4&3\\0&-1&-5\end{array}\right]$

This shows 3 pivot position matrixes.

Hence, a matrix is invertible and has 3 pivot positions.

7 0

3 years ago