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Komok [63]
4 years ago
12

Please I need help is the answer is C

Mathematics
1 answer:
NemiM [27]4 years ago
8 0
It’s d because 2x4x8 = 64
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Help neededdd.......
Leya [2.2K]

Answer:

1. -5a

Step-by-step explanation:

The definition of combining like terms is adding their coefficients, for example: 2x + 3x = (2+3)x = 5x.

So for this one, -21a+16a = (-21+16)a = -5a.

3 0
3 years ago
Angle DEF is an inscribed angle on a circle, and m∠DEF = 64°. What is the measure of arc DF?
Svetach [21]

Answer:

128°

Step-by-step explanation:

<u>The measure of an inscribed angle is half the measure of the intercepted arc.</u> That means that the intercepted arc is two times the inscribed angle.

Measure of the inscribed angle DEF is 64°, that means that the measure of the intercepted arc DF is 2×64°, which is 128°.

m\overset{\huge\frown}{DF} = 2 \times m\angle DE F = 2 \times 64^\circ = 128^\circ

6 0
2 years ago
A number decreased by 3 squares
Leya [2.2K]
Does that mean cube root?
\sqrt[3]{x}
I'm not sure so don't fully put this
6 0
4 years ago
If x+y=5,then what is the value of x3+y3+15xy​
a_sh-v [17]

Answer:

125

Step-by-step explanation:

x + y = 5

We need to have x^3 and y^3 in the expression, so cube both sides.

(x + y)^3 = 5^3

Expand the left side.

(x + y)(x + y)^2 = 125

(x + y)(x^2 + 2xy + y^2) = 125

x^3 + 2x^2y + xy^2 + x^2y + 2xy^2 + y^3 = 125

x^3 + 3x^2y + 3xy^2 + y^3 = 125

Now we need to separate x^3 + y^3.

x^3 + y^3 + 3x^2y + 3xy^2 = 125

We need to turn 3x^2y + 3xy^2 into 15xy.

Factor the GCF, 3xy, out of 3x^2y + 3xy^2.

x^3 + y^3 + 3xy(x + y) = 125

We know that x + y = 5, so substitute x + y with 5.

x^3 + y^3 + 3xy(5) = 125

x^3 + y^3 + 15xy = 125

Answer: 125

5 0
3 years ago
Select all the numbers that are multiples of 9.
liubo4ka [24]
9, 27, 45, 54, 81,
These are the multiples of 9.
9 *1
9 *3
9 *5
9 *6
9 *9
7 0
3 years ago
Read 2 more answers
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