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damaskus [11]
3 years ago
14

The equation a = (b1 + b2)h can be used to determine the area, a, of a trapezoid with height, h, and base lengths, b1 and b2. Wh

ich are equivalent equations? Check all that apply.
Mathematics
2 answers:
Arlecino [84]3 years ago
8 0
Hb1+hb2=a
a/h=b1+b2
a/(b1+b2)=h

erik [133]3 years ago
6 0
A & D is correct on engenuity 
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Karen earns $54.60 for working 6 hours. If the amount she earns varies directly with the
Andrei [34K]

Given:

Karen earns $54.60 for working 6 hours.

Amount she earns varies directly with the  number of hours she works.

She need to work to earn an  additional $260.

To find:

Number of hours she need to work to earn an  additional $260.

Solution:

Let the amount of earnings be A and number of hours be t.

According to question,

A\propto t

A=kt     ...(i)

where, k is constant of proportionality.

Karen earns $54.60 for working 6 hours.

54.60=k(6)

Divide both sides by 6.

\dfrac{54.60}{6}=k

9.1=k

Put k=9.1 in (i).

A=9.1t

Substitute A=260 in the above equation.

260=9.1t

Divide both sides by 9.1.

\dfrac{260}{9.1}=t

28.5714=t

t\approx 29

Therefore, she need to work extra about 29 hours to earn an  additional $260.

3 0
2 years ago
The ratio of Dobermans to terriers is 2:7. There are 774 dogs altogether.
kaheart [24]

Answer:

172-602 I think

Step-by-step explanation:

6 0
2 years ago
Simplify the expression -2x^2(4x − 3).<br> -8x3 − 6x2<br> -8x3 + 6x2<br> 8x3 − 6x2<br> 8x3 + 6x2
Digiron [165]
To simplify the expression we are going to use the distributive property of multiplication: a(b+c)=ab+ac.
We can infer from our problem that a=-2x^2, b=4x, and c=-3. So lets apply the property to simplify our expression:
-2x^2(4x-3)=(-2x^2)(4x)+(-2x^2)(-3)
(-2x^2)(4x)+(-2x^2)(-3)=-8x^3+6x^2

We can conclude that the correct answer is <span>-8x3 + 6x2</span>
8 0
3 years ago
Write the expression as the sin or cosine of an angle.<br> sin pi/3 cos pi/7 - sin pi/7 cos pi/3
postnew [5]

sin(4π21). Explanation: Notice that this fits the form of the sine subtraction formula: sin(A−B)=sin(A)cos(B)−cos(A)sin(B).

5 0
2 years ago
Can someone help me
Naddika [18.5K]

Answer:

Step-by-step explanation:

Hey, this question concerns the inscribed angle theorem.

The formula for this is:

∠ABC = 2*∠ADC

∴ ∠ABC = 40°

For proof, look up 'inscribed angle theorem (or central angle theorem)' on YT.

8 0
3 years ago
Read 2 more answers
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