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3 years ago

If x = 3 and y = -1, then 3x2 + 2xy - 5 = ? A: 18 B: 24 C: 12 D: 16

2 answers:

8 0

$x = 3 , \ y = -1 \\ \\ 3x^2 + 2xy - 5 = 3\cdot 3^2 + 2\cdot 3\cdot (-1)-5=\\ \\=3\cdot 9 -6-5=27-11=16 \\ \\ Answer : \ D: \ \ 16$

Alona [7]3 years ago

4 0

$3\cdot3^2+2\cdot3\cdot(-1)-5=27-6-5=16$

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The expressions a(8x + 7) and 4x + 3.5 are equivalent. What is the value of a?

Mashutka [201]

Answer:

Step-by-step explanation:

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3 years ago

What’s the correct answers for blankA and Blank B

zimovet [89]

Answer:

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Step-by-step explanation:

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3 years ago

What is the length of the longest side ?

exis [7]

Answer:

11 feet (Option C)

Step-by-step explanation:

Let the longer side be l and the shorter side be b.

We know that,

→ Perimeter of rectangle = 2 ( longer side + shorter side )

Here,

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→ 32 = 2 (l + b)

→ 32 = 2l + 2(5)

→ 32 = 2l + 10

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→ $\sf \dfrac{22}{2}$ = l

→ 11 = l

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3 years ago

A circular flower bed is 24m in diameter and has a circular sidewalk around it that is 2m wide. Find the area of the sidewalk in

sp2606 [1]

Answer:

163.3m²

Step-by-step explanation:

area = Pi(r²)

r = d / 2

r = 12

12² = 144

144 x 3.14 = 452.16

diameter of bigger circle = 24 + 4 (2 on each side)

28 / 2 = 14

14² = 196

196 x 3.14 = 615.44

sidewalk = bigger - smaller

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2 years ago

PLZZ HURRY q1) Simplify. 6(5p^3 − 6p)

AlexFokin [52]

Answer:

30p^3−36p

Step-by-step explanation:

6(5p^3−6p)

=(6)(5p^3+−6p)

=(6)(5p^3)+(6)(−6p)

=30p3−36p

6 0

3 years ago

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