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Sveta_85 [38]
3 years ago
10

Devaughn's age is two times Sydney's age. The sum of their ages is 72 What is Sydney's age?

Mathematics
1 answer:
vlabodo [156]3 years ago
4 0

Answer: Devaughn's age is 48 and Sydney's age is 24

Step-by-step explanation:

72 divided by 3 gives you 24.

24+24 is 48 which is Devaughn's age.48-72 gives you 24 which is Sydney's age

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What is the sum of 4 and its additive inverse
Ad libitum [116K]

Answer:

0

Step-by-step explanation:

additive inverse means any number to make the sum zero. in this case 4 +(-4)=0

4 0
3 years ago
5. What is the<br> complement of the<br> supplement of a 110° <br> angle?
Slav-nsk [51]
<h2>Answer:   20°</h2>

<h3>Step-by-step explanation:</h3>

Supplementary angles sum up to 180 °

Complementary angles sum up to 90°.

The supplement of 110° = 180° - 110° = 70°

The complement of 70° = 90° - 70° = 20°

<u>Simplier version:</u>

The complement of the supplement of 110° = (90° - (180° - 110°))

                                                                         = 20°

3 0
3 years ago
How do you find the surface area of a octahedron
Alenkasestr [34]
If it's a regular octahedron, then you can calculate it using the formula 2\sqrt3a^2 where a is the length of the edge.
If it's not regular, you have to calculate the area of each side individually.

6 0
3 years ago
For a statistics class project, a college student randomly samples 75 men who exercise at a gym regularly and 68 women who exerc
raketka [301]

Answer:

iii. The data do not provide sufficient evidence to conclude that the mean number of minutes exercised per week is larger for men than for women at this gym

Step-by-step explanation:

1) The hypotheses are

H0: u1 ≤ u2 against the claim Ha: u1 > u2

The men spend less or equal time than the women  at the gym each week

vs

the men  spend greater time  than the women at the gym each week

2) The test statistic is

t= (x1`- x2`) / √ s1²/n1+ s2²/n2

t= 65.7- 64.8/√(13.9)²/75 + (9.6)²/68

t= 0.9/√2.57613 +1.35529

t=0.4539

and the degrees of freedom is

3) υ = [s₁²/n1 + s₂²/n2]²/ (s₁²/n1 )²/ n1-1 + (s₂²/n2)²/n2-1

=[(13.9)²/75 + (9.6)²/68]²/ [(13.9)²/75 ]² /74 + [ (9.6)²/68]²/67

= 139

The degrees of freedom is always rounded in this calculation

4) The Critical region is [1.656, ∞]

5) t-score is outside of the critical region, so there is not enough evidence to reject H₀.

iii. The data do not provide sufficient evidence to conclude that the mean number of minutes exercised per week is larger for men than for women at this gym

4 0
2 years ago
Please answer fast need it now like now now!!!!!<br> 10+x&lt;5
katrin [286]
Subtract 10 from both sides
10 + x < 5
10 - 10 + x < 5 - 10
x < -5
So the answer is x < -5, or x is less than -5. Any number less than -5 would be the solution. Hope this helps!
7 0
3 years ago
Read 2 more answers
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