All categories

3 years ago

Help me really quick

Mathematics

2 answers:

kati45 [8]3 years ago

8 0

If you can't figure out how to do it, you can always use your answer choices, so for example, use choice a (21 degrees). Plug in 21 for x for both equations. So for the first equation that would be 7(21)-1= 146 and second equation 3(2)-9= 54. Then you would add the results, 146+54=200. In that case, choice 21 is wrong because both of these angles should equal to 180 since it is a supplementary angle. I hope that helped.

Luden [163]3 years ago

3 0

the answer is 19. you’re supposed to add them up to 180

You might be interested in

-. The ratio of boys to girls at a birthday party is

Charra [1.4K]

Answer:

Step-by-step explanation:

The 5 part of the ratio represents 35 girls , then

35 ÷ 5 = 7 ← value of 1 part of the ratio, then

4 parts = 4 × 7 = 28 ← number of boys

3 0

3 years ago

Read 2 more answers

Mary has 30 books and purchases 2 books per month. What is the variables?

marshall27 [118]

Variables are any letter so in the case of your equation the variables would be f and x.

6 0

3 years ago

−2(x + 3) = −2(x + 1) − 4.

IrinaVladis [17]

$- 2(x + 3) = - 2(x + 1) - 4 \\ - 2x - 6 = - 2x - 2 - 4 \\ - 2x = - 2x \\ x = x$

Every x is a solution.

5 0

3 years ago

grandymaker [24]

Answer:

2 seconds
72 feet

Step-by-step explanation:

The usual equation used for the vertical component of ballistic motion is ...

h(t) = -16t² +v₀t +h₀

where v₀ is the initial upward velocity, and h₀ is the initial height. Units of distance are feet, and units of time are seconds.

Your problem statement gives ...

v₀ = 64 ft/s

h₀ = 8 ft

so the equation of height is ...

h(t) = -16t² +64t +8

For quadratic ax² +bx +c, the axis of symmetry is x=-b/(2a). Then the axis of symmetry of the height equation is ...

t = -64/(2(-16)) = 2

The object will reach its maximum height after 2 seconds.

The height at that time will be ...

h(2) = -16(2²) +64(2) +8 = 72

The maximum height will be 72 feet.

5 0

3 years ago

Plz need help really fast will give brainlist IF CAN. NO LINKS OR BIT WEBSITES OR FILES

Korolek [52]

Answer:

30 plants.

Step-by-step explanation:

Elizabeth has 1 and 7/10 as many plants as Rosalie, so she has more plants than her, since the fraction is greater than one. So that means you need to take the number of plants Elizabeth has and divide it by the fraction.

51 / (1 7/10) = 30

To do this, remember to make both sides into a mixed number fraction, flip the second fraction, and then multiply them together. So 1 and 7/10 becomes 17/10 and 51 becomes 51/1. Then flip 17/10 and multiply.

51/1 * (10/17) = 510/17

Then simplify.

510/17 = 30

Hope this helps.

3 0

2 years ago