Please help with 7 8 or 9 nine is optional

Answers

Answer 1

Answer: 7. acute means all angles are less than 90
right triangle mean that one angle is 90 degrees
it is not posible for all angles to be less than 90 and one angle is 90 so this is not possible

8. equilateral triangle has all equal angles
180 degrees per triangle
3 angles
180/3=60
each angle=60
acute means lal angles less than 90
all angles=60
60<90
true

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In 1950, there were 40.3 million cars registered in the United States. In 1990, there were 133.7 million cars registered in the United States. What was the percent increase of registered cars from 1950 to 1990?

The circumference of a circular clock is 31.4 inches.What is the diameter of the clock

Answers

Circumference of a circle=πd
d=diameter
Circumference=31.4 in
π=3.141592654...

31.4 in=πd
d=3.14 in / π=0.999493...in≈1 in

Answer: diameter=1 in

The circumference formula is
C = $2 \pi$ r

We know the circumference, so lets find the radius and we will get the diameter.

31.4 = 2 $\pi r$
divide by 2 $\pi$ to isolate r

$(31.4)/(2 \pi )$ = $(2 \pi r)/(2 \pi )$
2 $\pi$ and 2 $\pi$ cancels out.

0.4997 = r
0.5 in ≈ r (approximately)

Diameter is 2 × radius
2 × 0.5
1 in

What is the volume of a cube with a side length of 5 cm? help asapA) 10 cm

B) 15 cm

C) 25 cm

D) 125 cm

Answers

V = a * b * c
a,b,c- lengths of sides
in here a=b=c=5cm
V=5*5*5 = 125 cm^3

or
V=a^3 = 5^3 =125 cm^3

If a Ferrari drove 300 kilometers in one and a half hours. How fast was the car going?

Answers

it would be 200Km/Hr, 1.5=3/2, or three halves, 300 can be divided by three to get 100, making it 100 per half hour, and since car speeds are to the hour, you double that to get 200 per hour.

Reduced ratio of 2:10:14

Answers

Answer:
1:5:7

Explanation:
A reduced ratio means that the ratio has a greatest common factor that the numbers in the ratio can divide by for simple whole numbers. In this case, the GCF (greatest common factor) is 2 because all of the numbers are divisible by 2. After dividing 2:10:14 by 2, you get 1:5:7.

1:5:7 because if you divide each by two you get that as an answer

Give three possible solutions to: x + 5 < 10

Answers

Answer:

1. $x<5$

Step-by-step explanation:

when i do it .... it keep giving me the same thing.

Answer:

Step-by-step explanation:

These value add up to be less than 10.

Without calculating, is the equation (1.8 x 3) x 2.1 = 3 x (1.8 x 2.1) true or false? Explain your reasoning

Answers

The expression is correct because changing the place in the multiplication operation does not affect the final result.

What is the equation?

An equation is a statement that two expressions, which include variables and/or numbers, are equal. In essence, equations are questions, and efforts to systematically find solutions to these questions have been the driving forces behind the creation of mathematics.

It is given that,the equation is 1.8 x 3) x 2.1 = 3 x (1.8 x 2.1) t

L.H.S

=(1.8×3)×2.1

=5.4×2.1

=11.34

R.H.S.

=3 x (1.8 x 2.1)

=3×3.78

=11.34

L.H.S.=R.H.S.

Thus, the expression is correct because changing the place in the multiplication operation does not affect the final result.

Learn more about the equation here,