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3 years ago

Which expression has a value of 48?

Mathematics

1 answer:

marin [14]3 years ago

5 0

I'm gonna say it should be B. Hope I'm right

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What number must be added to the expression below to complete the square? x² - 18x

kiruha [24]

Answer:

$\boxed {\boxed {\sf 81}}$

Step-by-step explanation:

The standard form of a quadratic is:

$ax^2+bx+c$

To complete the square, the a (leading coefficient) must be 1 and there can only be terms with variables on one side.

The expression given:

$x^2-18x$

follows these rules. Next, we divide the b (linear coefficient) by 2, then square it. Basically:

$(\frac{b}{2})^2$

The b in the expression is -18.

$(\frac{-18}{2})^2$

$(-9)^2= -9*-9= 81$

This is the number that is added.

5 0

3 years ago

On a coordinate plane, triangle B C D has points (negative 4, 1), (negative 2, 1), (negative 4, 3). Triangle B prime C prime D p

tatyana61 [14]

9514 1404 393

Answer:

90° CCW

Step-by-step explanation:

The transformation from B to B' is ...

B(-4, 1) ⇒ B'(-1, -4)

(x, y) ⇒ (-y, x) . . . . . matches the transformation for 90° CCW

8 0

2 years ago

The probability that a certain kind of component will survive a shock test is 3/4. Find the probability that exactly 2 of the ne

Marina86 [1]

Answer:

Therefore the required probability is $=\frac{27}{128}$

Step-by-step explanation:

The probability of success is $\frac{3}{4}$

The number of trial = 4

X= the items survive out of 4

$P(x=r)=^nC_rq^{n-r}p^r$ p =the probability of success and q = the probability failure.

p= $\frac{3}{4}$ and $q=(1-\frac{3}{4})=\frac{1}{4}$

$\therefore P(X=2)=^4C_2(\frac{1}{4} )^2(\frac{3}{4} )^2$

$=\frac{4!}{2!2!} (\frac{1}{16} )(\frac{9}{16} )$

$=\frac{27}{128}$

Therefore the required probability is $=\frac{27}{128}$

3 0

3 years ago

Judy buys dorito bags $0.40 each and sold them for $1.00 each. what was the percent increase

myrzilka [38]

Getting the percentage increase, we can form the formula or equation.
Percentage increase = ($1.00 - $0.40) / $0.40 * 100
Percentage increase = ($0.60) / $0.40 * 100
Percentage increase = 1.5 * 100
Percentage increase = 150%

So there is a 150% increase from the original price.

6 0

3 years ago

Please Help! Struggling to understand the question ive tried everything

allsm [11]

Answer:

4,16

Step-by-step explanation:

36 buttons = 12×12 square inches

1 button = 12×12÷36=4 square inches

4 buttons=4×4=16square inches

4 0

2 years ago