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Brilliant_brown [7]
3 years ago
12

Need help please with explanations ❤️

Mathematics
1 answer:
Lubov Fominskaja [6]3 years ago
4 0

Answer:

It will take Jack about 7.1 hours alone

Step-by-step explanation:

You are given the equation

t/a + t/b = 1

where t is the time working together, a is the time Jill spends working alone, b is the time Jack spends working alone

Substituting these numbers in

3.2/5.8 + 3.2 /b = 1

Multiply both side by 5.8b to clear the fractions

5.8 b * (3.2/5.8 + 3.2 /b )= 1*5.8b

Distribute

3.2b + 5.8*3.2 = 5.8b

Subtract 3.2b on each side

3.2b -3.2b+ 5.8*3.2 = 5.8b-3.2b

5.8*3.2 = 2.6b

18.56 = 2.6b

Divide by 2.6 on each side

18.56 /2.6 = 2.6 b/2.6

7.138 = b

It will take Jack about 7.1 hours alone

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the triangles below are congruent and their corresponding parts are marked. name all the corresponding congruent angles and side
GuDViN [60]

Answer:

See explanation

Step-by-step explanation:

The triangles below are congruent and their corresponding parts are marked.

a) Angles marked with one arc are congruent, so \angle B\cong \angle Z.

Angles marked with two arcs are congruent, so \angle A\cong \angle Y.

Angles marked with three arcs are congruent, so \angle C\cong \angle X.

b) Sides marked with one segment are congruent, so \overline {AC}\cong \overline {YX}.

Sides marked with two segments are congruent, so \overline {BC}\cong \overline {ZX}.

Sides marked with three segments are congruent, so \overline {AB}\cong \overline {YZ}.

c) Name teo congruent triangle following the congruence of angles:

\triangle BCA\cong \triangle ZXY

6 0
4 years ago
PLEASE HELP!!!
andrey2020 [161]

Answer:

567 mph

Step-by-step explanation:

The speed will actually just be the slope of the line. Slope is change in y-coordinates over change in x-coordinates. We can pick any two points for this; let's just do (1, 567) and (2, 1134).

Slope = (1134 - 567) / (2 - 1) = 567 / 1 = 567

The speed is thus 567 miles/hour.

6 0
4 years ago
Read 2 more answers
G(r)=-1-7r <br>g(6)=?<br><br>does anyone know the answer to this?
Lesechka [4]

So for this, replace the r variable in the equation with 6 to solve:

g(6)=-1-7*6\\ g(6)=-1-42\\ g(6)=-43

7 0
4 years ago
Find the x intercept of the parabola with vertex (1,20) and u intercept (0,16). Write answer in form (X1,y2)(x2,y2)
ioda
Hello,

Answer (1-√5,0) , (1+√5,0)

Indeed,

S=(1,20)
==> y=k*(x-1)²+20
(0,16) is a point of the parabola
==>16=k*(0-1)²+20==>k=-4
Parabola: y=-4(x-1)²+20
if y=0 then -4(x-1)²+20=0==> 4(x-1)²=20=> (x-1)²=5 ==> x=1+√5 or x=1-√5

7 0
3 years ago
How can two different rectangles both have a perimeter of 24 cm​
dem82 [27]

Explanation:

Perimeter is simply the sum of all the edges. The same way 10 can be made of 4+6 or 3+7, the perimeter can be made by many combinations. if you know the 2 must equal 24cm, then we can create numerous combinations.

8 0
3 years ago
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